https://diagonalargument.com/2020/04/28/eschers-toroidal-print-gallery/https://diagonalargument.com/wp-content/uploads/2020/04/print_gallery_by_m._c._escher.jpgPrint_Gallery_by_M._C._Escher(From Wikimedia 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Forest2025-12-05T20:15:27+00:00monthlyhttps://diagonalargument.com/2025/03/22/set-theory-jottings-5-zermelo-to-the-rescue-part-1/2025-12-05T20:14:11+00:00monthlyhttps://diagonalargument.com/2025/08/22/set-theory-jottings-17-ordinals-revisited/2025-12-05T20:11:27+00:00monthlyhttps://diagonalargument.com/2025/08/21/set-theory-jottings-16-axioms-of-zfc/2025-12-06T13:59:38+00:00monthlyhttps://diagonalargument.com/2025/11/18/from-kepler-to-ptolemy-22/https://diagonalargument.com/wp-content/uploads/2025/11/libration-force.jpglibration-forceLibration Force2025-12-02T19:57:06+00:00monthlyhttps://diagonalargument.com/2025/11/13/from-kepler-to-ptolemy-21/https://diagonalargument.com/wp-content/uploads/2025/11/stephenson-fig14.jpgstephenson-fig14https://diagonalargument.com/wp-content/uploads/2025/11/dipole-inverse-linear.jpgdipole-inverse-linearhttps://diagonalargument.com/wp-content/uploads/2025/11/1024px-whirlpool_playa_del_rey_california.jpg1024px-Whirlpool_playa_del_Rey_california2025-11-18T12:43:28+00:00monthlyhttps://diagonalargument.com/2025/07/29/from-kepler-to-ptolemy-19/2025-11-17T16:56:46+00:00monthlyhttps://diagonalargument.com/who-inverted-and-squared-gravity/https://diagonalargument.com/wp-content/uploads/2025/11/ismael_boulliau.jpegIsmaël_Boulliau2025-11-13T17:14:51+00:00weekly0.6https://diagonalargument.com/2025/08/07/from-kepler-to-ptolemy-20/https://diagonalargument.com/wp-content/uploads/2025/08/whirlpool.jpgwhirlpool2025-09-19T20:57:35+00:00monthlyhttps://diagonalargument.com/2025/05/31/from-kepler-to-ptolemy-16/2025-09-07T23:13:52+00:00monthlyhttps://diagonalargument.com/2025/08/19/set-theory-jottings-14-from-zermelo-to-zfc-replacement-and-foundation/2025-08-20T17:27:39+00:00monthlyhttps://diagonalargument.com/2025/06/30/set-theory-jottings-13-from-zermelo-to-zfc-everythings-a-set/2025-08-19T15:38:45+00:00monthlyhttps://diagonalargument.com/2025/06/07/from-kepler-to-ptolemy-17/https://diagonalargument.com/wp-content/uploads/2025/06/mysterium-cosmographicum.jpgmysterium-cosmographicum2025-08-07T17:10:07+00:00monthlyhttps://diagonalargument.com/2025/06/27/from-kepler-to-ptolemy-18/https://diagonalargument.com/wp-content/uploads/2025/06/mars_actual_orbit.jpgMars_actual_orbitActual Orbit of Mars2025-07-29T18:49:25+00:00monthlyhttps://diagonalargument.com/2025/06/14/set-theory-jottings-12-zermelo-on-definiteness/2025-11-12T21:37:31+00:00monthlyhttps://diagonalargument.com/mathnotes/first-order-categorical-logic-the-series/2025-06-11T02:45:53+00:00weekly0.6https://diagonalargument.com/2025/06/04/first-order-categorical-logic-13/https://diagonalargument.com/wp-content/uploads/2025/06/restriction-nat-trans.pngrestriction-nat-transhttps://diagonalargument.com/wp-content/uploads/2025/05/beck-chevalley-quantifiers.pngbeck-chevalley-quantifiers2025-06-11T02:42:32+00:00monthlyhttps://diagonalargument.com/2025/06/09/first-order-categorical-logic-14/2025-06-09T23:24:58+00:00monthlyhttps://diagonalargument.com/2025/06/03/set-theory-jottings-10-axiomatic-set-theory/2025-06-09T14:11:38+00:00monthlyhttps://diagonalargument.com/2019/05/06/non-standard-models-of-arithmetic-1/2025-06-08T16:01:17+00:00monthlyhttps://diagonalargument.com/2019/05/07/non-standard-models-of-arithmetic-2/2025-06-08T15:59:55+00:00monthlyhttps://diagonalargument.com/2025/03/22/first-order-categorical-logic-12/https://diagonalargument.com/wp-content/uploads/2025/03/nat-trans-2-1.pngnat-trans-2Left Adjointshttps://diagonalargument.com/wp-content/uploads/2025/03/nat-trans-1.pngnat-trans-1A natural transformation2025-06-05T00:19:58+00:00monthlyhttps://diagonalargument.com/about/2025-06-03T13:41:06+00:00weekly0.6https://diagonalargument.com/2025/05/28/set-theory-jottings-9-cantor-normal-form/2025-06-03T12:29:20+00:00monthlyhttps://diagonalargument.com/2019/06/02/first-order-categorical-logic-1/2025-06-01T18:19:15+00:00monthlyhttps://diagonalargument.com/2025/04/19/from-kepler-to-ptolemy-13/https://diagonalargument.com/wp-content/uploads/2025/04/latitude.pnglatitude2025-05-31T10:16:29+00:00monthlyhttps://diagonalargument.com/2025/04/05/nonstandard-models-of-arithmetic-32/2025-05-31T10:13:31+00:00monthlyhttps://diagonalargument.com/2025/05/25/set-theory-jottings-8-ordinal-arithmetic/2025-05-31T10:10:28+00:00monthlyhttps://diagonalargument.com/2025/05/24/from-kepler-to-ptolemy-15/https://diagonalargument.com/wp-content/uploads/2025/05/manshurat-fig.pngmanshurat-figSawn-Off Model (from 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Model2025-05-31T10:09:57+00:00monthlyhttps://diagonalargument.com/2025/05/20/from-kepler-to-ptolemy-14/2025-05-31T10:08:41+00:00monthlyhttps://diagonalargument.com/2025/03/28/from-kepler-to-ptolemy-12/https://diagonalargument.com/wp-content/uploads/2025/03/mercury.pngmercury2025-05-31T10:07:02+00:00monthlyhttps://diagonalargument.com/2025/03/23/from-kepler-to-ptolemy-11/https://diagonalargument.com/wp-content/uploads/2025/03/venus.pngvenusVenus2025-05-31T10:06:13+00:00monthlyhttps://diagonalargument.com/2019/07/26/review-smullyan-fitting-set-theory-and-the-continuum-problem/2025-04-22T19:09:31+00:00monthlyhttps://diagonalargument.com/mathnotes/nonstandard-models-of-arithmetic-the-series/2025-04-05T04:48:13+00:00weekly0.6https://diagonalargument.com/2020/11/20/nonstandard-models-of-arithmetic-24/https://diagonalargument.com/wp-content/uploads/2020/10/indicators-1.pngindicators2025-04-05T04:42:06+00:00monthlyhttps://diagonalargument.com/2020/10/12/non-standard-models-of-arithmetic-20/https://diagonalargument.com/wp-content/uploads/2020/10/trudy.jpgtrudyTrudy Campbellhttps://diagonalargument.com/wp-content/uploads/2020/10/arith-hierarchy.pngarith-hierarchy2025-04-03T16:20:18+00:00monthlyhttps://diagonalargument.com/2020/10/18/non-standard-models-of-arithmetic-21/2025-04-03T16:17:02+00:00monthlyhttps://diagonalargument.com/2025/03/04/from-kepler-to-ptolemy-10/https://diagonalargument.com/wp-content/uploads/2025/03/outer-planet.pngouter-planetModel for an Outer Planet2025-03-24T17:29:01+00:00monthlyhttps://diagonalargument.com/2025/03/02/first-order-categorical-logic-11/2025-03-24T17:28:33+00:00monthlyhttps://diagonalargument.com/2024/12/24/set-theory-jottings-1-philosophy-and-naive-set-theory/2025-03-24T17:26:17+00:00monthlyhttps://diagonalargument.com/2025/03/02/set-theory-jottings-4-ordinals/https://diagonalargument.com/wp-content/uploads/2025/03/ordinal-tree.jpgordinal-treeThe Ordinal Tree for ω²2025-03-22T15:16:41+00:00monthlyhttps://diagonalargument.com/2024/12/22/from-kepler-to-ptolemy-2/https://diagonalargument.com/wp-content/uploads/2024/12/deferent-epicycle-1.pngdeferent-epicyclehttps://diagonalargument.com/wp-content/uploads/2024/12/scaling.pngscalinghttps://diagonalargument.com/wp-content/uploads/2024/12/heliocentric-geocentric.pngheliocentric-geocentric2025-03-19T21:25:06+00:00monthlyhttps://diagonalargument.com/2025/03/02/from-kepler-to-ptolemy-9/https://diagonalargument.com/wp-content/uploads/2025/03/moon.pngmoonThe Moon's Orbit2025-03-13T11:08:15+00:00monthlyhttps://diagonalargument.com/2025/02/26/from-kepler-to-ptolemy-8/https://diagonalargument.com/wp-content/uploads/2025/02/ptolemy-sun.jpgptolemy-sunPtolemy's Solar Modelhttps://diagonalargument.com/wp-content/uploads/2025/02/mean-sun.pngmean-sunMean Sun and True Sun2025-03-13T11:04:47+00:00monthlyhttps://diagonalargument.com/2025/02/25/from-kepler-to-ptolemy-7/https://diagonalargument.com/wp-content/uploads/2025/02/opposition-conjunction.pngopposition-conjunctionOpposition and Conjunctionhttps://diagonalargument.com/wp-content/uploads/2025/02/ecliptic_grid_globe.pngEcliptic_grid_globeEcliptic Coordinates<br />(From <a href="https://commons.wikimedia.org/wiki/File:Ecliptic_grid_globe.png">Wikimedia</a>)2025-03-13T11:02:28+00:00monthlyhttps://diagonalargument.com/2025/02/23/set-theory-jottings-3-the-paradoxes/2025-03-13T11:02:00+00:00monthlyhttps://diagonalargument.com/2024/12/25/from-kepler-to-ptolemy-4/https://diagonalargument.com/wp-content/uploads/2024/12/equant-area-quadrants.jpgequant-area-quadrantshttps://diagonalargument.com/wp-content/uploads/2024/12/speed-law-comparison.pngspeed-law-comparisonhttps://diagonalargument.com/wp-content/uploads/2024/12/velocity-components.pngvelocity-componentshttps://diagonalargument.com/wp-content/uploads/2024/12/area-law.pngarea-lawhttps://diagonalargument.com/wp-content/uploads/2024/12/polar-coords.pngpolar-coordshttps://diagonalargument.com/wp-content/uploads/2024/12/equant.pngequant(Note: Ptolemy’s equant circle had the same radius as the deferent)2025-03-04T21:16:27+00:00monthlyhttps://diagonalargument.com/2024/12/24/from-kepler-to-ptolemy-3/https://diagonalargument.com/wp-content/uploads/2024/12/ellipticity.pngellipticityhttps://diagonalargument.com/wp-content/uploads/2024/12/ellipse.pngellipse2025-03-04T21:15:05+00:00monthlyhttps://diagonalargument.com/2019/09/16/first-order-categorical-logic-5/2025-03-03T20:31:59+00:00monthlyhttps://diagonalargument.com/2019/06/22/first-order-categorical-logic-3/2025-03-03T20:06:18+00:00monthlyhttps://diagonalargument.com/2024/12/24/set-theory-jottings-2-cantors-paradise/https://diagonalargument.com/wp-content/uploads/2024/11/cantor-rn-diagram.pngCantor-Rn-diagram2025-03-03T14:27:30+00:00monthlyhttps://diagonalargument.com/2025/01/17/first-order-categorical-logic-10/2025-03-03T00:00:51+00:00monthlyhttps://diagonalargument.com/2025/02/09/from-kepler-to-ptolemy-6/2025-02-25T22:09:32+00:00monthlyhttps://diagonalargument.com/2025/01/05/first-order-categorical-logic-9/2025-02-24T16:54:41+00:00monthlyhttps://diagonalargument.com/2024/12/31/first-order-categorical-logic-8/2025-02-24T16:54:02+00:00monthlyhttps://diagonalargument.com/2024/12/26/from-kepler-to-ptolemy-5/https://diagonalargument.com/wp-content/uploads/2024/12/trees.pngtreesTree Analogyhttps://diagonalargument.com/wp-content/uploads/2024/12/retrograde_mars.jpgretrograde_marsRetrograde Motion of Mars2025-02-24T16:53:34+00:00monthlyhttps://diagonalargument.com/2024/12/25/first-order-categorical-logic-7/https://diagonalargument.com/wp-content/uploads/2024/12/zxy3yie_f0y541vi8ui2ebt2yzr5bc2xbfz6q50ocgc.webpzXY3yIE_F0Y541vi8uI2ebT2yzr5bc2XbFz6q50ocgc2025-02-24T16:53:05+00:00monthlyhttps://diagonalargument.com/2024/12/22/from-kepler-to-ptolemy-1/2024-12-26T18:18:06+00:00monthlyhttps://diagonalargument.com/2024/06/16/eminent-victorians/https://diagonalargument.com/wp-content/uploads/2024/06/eminent-victorians.jpgeminent-victorians2024-12-26T18:16:59+00:00monthlyhttps://diagonalargument.com/2019/09/21/first-order-categorical-logic-6/2024-12-26T13:19:36+00:00monthlyhttps://diagonalargument.com/2024/04/24/akira-kurosawa/https://diagonalargument.com/wp-content/uploads/2024/04/ikiru.jpgikiruStill from <em>Ikiru</em>2024-06-16T19:56:51+00:00monthlyhttps://diagonalargument.com/2024/06/05/the-one-change-in-the-remake-of-mean-girls-all-the-other-websites-missed/https://diagonalargument.com/wp-content/uploads/2024/06/meangirls-eqn-2024-v4.jpgmeangirls-eqn-2024-v4https://diagonalargument.com/wp-content/uploads/2024/06/meangirls-2004.jpgmeangirls-20042024-12-28T15:45:50+00:00monthlyhttps://diagonalargument.com/mathnotes/2024-05-02T16:00:28+00:00weekly0.6https://diagonalargument.com/2019/09/15/epstein-relativity-diagrams/https://diagonalargument.com/wp-content/uploads/2024/05/epstein-length-contraction.jpgepstein-length-contractionhttps://diagonalargument.com/wp-content/uploads/2019/09/basic-epstein-diagram.pngbasic-epstein-diagramhttps://diagonalargument.com/wp-content/uploads/2019/09/epstein-vs-minkowski.pngepstein-vs-minkowski2024-05-05T07:25:40+00:00monthlyhttps://diagonalargument.com/2024/04/08/the-peloponnesian-war-2/https://diagonalargument.com/wp-content/uploads/2024/04/peloponnesian-war.jpgpeloponnesian-war2024-05-02T14:28:36+00:00monthlyhttps://diagonalargument.com/2023/07/05/the-monoenergetic-heresy-part-2/https://diagonalargument.com/wp-content/uploads/2020/10/aristotle.jpgAristotlehttps://diagonalargument.com/wp-content/uploads/2020/10/pooh-penwiper.pngpooh-penwiper2024-05-02T14:27:57+00:00monthlyhttps://diagonalargument.com/2023/08/22/aristotle-and-falling-objects/2024-05-02T14:26:23+00:00monthlyhttps://diagonalargument.com/2019/06/12/first-order-categorical-logic-2/2024-03-04T15:41:49+00:00monthlyhttps://diagonalargument.com/2020/04/29/the-monoenergetic-heresy-part-1/https://diagonalargument.com/wp-content/uploads/2020/04/heraclius.jpgHeraclius2023-07-10T22:53:48+00:00monthlyhttps://diagonalargument.com/2023/04/20/nonstandard-models-of-arithmetic-31/2023-05-01T16:59:12+00:00monthlyhttps://diagonalargument.com/2023/05/01/quadratic-reciprocity/https://diagonalargument.com/wp-content/uploads/2023/05/f19-orbits.jpgf19-orbits2023-05-01T16:43:47+00:00monthlyhttps://diagonalargument.com/2023/04/14/nonstandard-models-of-arithmetic-30/https://diagonalargument.com/wp-content/uploads/2023/04/up-over-down.jpgup-over-down2023-04-20T17:26:47+00:00monthlyhttps://diagonalargument.com/2023/04/02/nonstandard-models-of-arithmetic-29/2023-04-14T16:41:01+00:00monthlyhttps://diagonalargument.com/2023/02/23/nonstandard-models-of-arithmetic-28/2023-04-02T22:20:22+00:00monthlyhttps://diagonalargument.com/2020/11/23/topics-in-nonstandard-arithmetic-7-extensions-and-substructures/2023-04-02T20:30:13+00:00monthlyhttps://diagonalargument.com/2023/02/12/nonstandard-models-of-arithmetic-27/2023-02-23T20:43:28+00:00monthlyhttps://diagonalargument.com/2023/01/31/very-unique/https://diagonalargument.com/wp-content/uploads/2023/01/microwave.jpgmicrowaveMy unique (but not very unique) microwave2023-02-12T17:20:35+00:00monthlyhttps://diagonalargument.com/2023/01/06/nonstandard-models-of-arithmetic-26/2023-02-12T17:20:03+00:00monthlyhttps://diagonalargument.com/2023/01/14/topics-in-nonstandard-arithmetic-10-truth-part-4/https://diagonalargument.com/wp-content/uploads/2022/12/bin-tree-4.jpgbin-tree2023-02-11T18:37:59+00:00monthlyhttps://diagonalargument.com/2023/01/20/selections-from-the-history-of-astronomy/https://diagonalargument.com/wp-content/uploads/2023/01/armillary-sphere-santa-maria.jpgarmillary-sphere-santa-mariaArmillary Sphere, Facade of Santa Maria Novella (Wikimedia Commons)2023-01-31T18:24:40+00:00monthlyhttps://diagonalargument.com/2022/12/20/the-secret-history-of-the-mongols/2023-01-20T22:23:53+00:00monthlyhttps://diagonalargument.com/2020/10/22/topics-in-nonstandard-arithmetic-7-truth-part-3/https://diagonalargument.com/wp-content/uploads/2020/10/delta-0-tree-2.pngdelta-0-tree2023-01-14T19:30:28+00:00monthlyhttps://diagonalargument.com/2020/11/26/topics-in-nonstandard-arithmetic-9-tricks-with-quantifiers/2023-01-14T19:27:43+00:00monthlyhttps://diagonalargument.com/2022/12/28/nonstandard-models-of-arithmetic-25/2023-01-13T16:16:17+00:00monthlyhttps://diagonalargument.com/2020/09/20/non-standard-models-of-arithmetic-18/https://diagonalargument.com/wp-content/uploads/2020/08/parse-tree-1.pngparse-tree2023-01-13T16:11:58+00:00monthlyhttps://diagonalargument.com/2019/09/14/non-standard-models-of-arithmetic-12/2022-12-26T19:12:13+00:00monthlyhttps://diagonalargument.com/2019/05/10/non-standard-models-of-arithmetic-5/2022-12-26T18:06:01+00:00monthlyhttps://diagonalargument.com/2021/01/20/science-and-the-founding-fathers/https://diagonalargument.com/wp-content/uploads/2021/01/founders.pngfounders2022-12-23T17:20:57+00:00monthlyhttps://diagonalargument.com/2020/10/02/topics-in-nonstandard-arithmetic-2-the-arithmetic-hierarchy/2022-01-06T17:14:53+00:00monthlyhttps://diagonalargument.com/2020/09/24/nonstandard-arithmetic-topics-1-table-setting/2022-01-06T17:08:11+00:00monthlyhttps://diagonalargument.com/2019/07/17/stirlings-formula/2021-10-03T20:50:53+00:00monthlyhttps://diagonalargument.com/2020/12/27/cornflakes-and-bonti-knives/https://diagonalargument.com/wp-content/uploads/2020/12/west-bengal-map.gifwest-bengal-maphttps://diagonalargument.com/wp-content/uploads/2020/12/bengali-food.jpgbengali-food2021-01-20T16:04:05+00:00monthlyhttps://diagonalargument.com/2020/12/15/the-peloponnesian-war/https://diagonalargument.com/wp-content/uploads/2020/12/peleponnesian-war.jpgpeleponnesian-war2020-12-27T16:43:32+00:00monthlyhttps://diagonalargument.com/2020/12/08/socrates-bad-guy/https://diagonalargument.com/wp-content/uploads/2020/12/death_of_socrates.jpgDeath_of_Socrates2020-12-23T19:59:53+00:00monthlyhttps://diagonalargument.com/2020/12/01/gracefully-insane/https://diagonalargument.com/wp-content/uploads/2020/11/gracefully-insane.pnggracefully-insane2020-12-23T19:59:17+00:00monthlyhttps://diagonalargument.com/2020/11/25/the-second-french-revolution/https://diagonalargument.com/wp-content/uploads/2020/11/liberty_leading_the_people.jpgLiberty_Leading_the_People2020-12-23T19:56:53+00:00monthlyhttps://diagonalargument.com/2020/12/23/the-%e2%88%921-dimensional-reduced-homology-group-of-the-empty-set/2020-12-23T19:55:02+00:00monthlyhttps://diagonalargument.com/2020/11/09/the-making-of-the-atomic-bomb/https://diagonalargument.com/wp-content/uploads/2020/11/mushroom-cloud.jpgmushroom-cloudhttps://diagonalargument.com/wp-content/uploads/2020/11/making-atomic-bomb.jpgmaking-atomic-bomb2020-11-21T15:14:03+00:00monthlyhttps://diagonalargument.com/2020/11/10/the-decision-to-drop-the-bomb/https://diagonalargument.com/wp-content/uploads/2020/11/hiroshima.jpghiroshima2020-11-21T15:13:36+00:00monthlyhttps://diagonalargument.com/2020/10/31/nonstandard-models-of-arithmetic-23/2020-11-21T07:09:22+00:00monthlyhttps://diagonalargument.com/2019/05/28/why-atomic-bomb-instead-of-nuclear/2020-11-10T13:44:07+00:00monthlyhttps://diagonalargument.com/2020/10/13/truth-1/2020-11-03T20:52:37+00:00monthlyhttps://diagonalargument.com/2020/10/27/non-standard-models-of-arithmetic-22/2020-10-31T14:53:59+00:00monthlyhttps://diagonalargument.com/2019/05/27/non-standard-models-of-arithmetic-9/2020-10-27T21:24:37+00:00monthlyhttps://diagonalargument.com/2020/10/15/topics-in-nonstandard-arithmetic-5-truth-part-2/2020-10-22T23:51:55+00:00monthlyhttps://diagonalargument.com/2020/10/21/topics-in-nonstandard-arithmetic-6-the-axioms/2020-10-22T23:48:53+00:00monthlyhttps://diagonalargument.com/2020/10/11/topics-in-nonstandard-arithmetic-3-the-arithmetic-hierarchy-part-2/2020-10-21T19:18:11+00:00monthlyhttps://diagonalargument.com/mathnotes/set-theory-meetup/2020-10-18T14:49:23+00:00weekly0.6https://diagonalargument.com/2020/09/24/non-standard-models-of-arithmetic-19/2020-10-12T21:48:11+00:00monthlyhttps://diagonalargument.com/2020/09/22/bundles-and-laplacians/https://diagonalargument.com/wp-content/uploads/2020/09/hatcher-figs.pnghatcher-figshttps://diagonalargument.com/wp-content/uploads/2020/09/poincare-dual-fig.pngpoincare-dual-fighttps://diagonalargument.com/wp-content/uploads/2020/09/horned-sphere.pnghorned-spherehttps://diagonalargument.com/wp-content/uploads/2020/09/cube-bundle.pngcube-bundle2020-10-04T15:21:01+00:00monthlyhttps://diagonalargument.com/mathnotes/nonstandard-models-of-arithmetic-the-series/a-comment-thread-for-nsa-7-and-nsa-8/2020-10-01T04:18:21+00:00weekly0.6https://diagonalargument.com/2020/09/30/nonstandard-arithmetic-a-long-comment-thread/2020-10-16T17:22:04+00:00monthlyhttps://diagonalargument.com/2019/05/17/non-standard-models-of-arithmetic-8/2020-09-30T15:15:44+00:00monthlyhttps://diagonalargument.com/2019/05/17/non-standard-models-of-arithmetic-7-2/2022-12-18T20:15:13+00:00monthlyhttps://diagonalargument.com/2020/08/07/non-standard-models-of-arithmetic-15/2020-09-24T14:34:29+00:00monthlyhttps://diagonalargument.com/2019/05/10/non-standard-models-of-arithmetic-6/2020-09-22T19:05:12+00:00monthlyhttps://diagonalargument.com/2019/05/10/non-standard-models-of-arithmetic-4/2020-09-22T14:15:25+00:00monthlyhttps://diagonalargument.com/2020/09/13/non-standard-models-of-arithmetic-17/2020-09-22T12:04:41+00:00monthlyhttps://diagonalargument.com/2020/08/16/non-standard-models-of-arithmetic-16/2020-09-21T16:24:10+00:00monthlyhttps://diagonalargument.com/2019/06/26/first-order-categorical-logic-4/https://diagonalargument.com/wp-content/uploads/2019/06/logic-adjoints.pnglogic-adjoints2020-08-28T01:11:08+00:00monthlyhttps://diagonalargument.com/2020/05/26/algebraic-geometry-jottings-18/https://diagonalargument.com/wp-content/uploads/2020/05/semicubical-parabola-e1590241519736.pngsemicubical-parabola<em>y</em>²=<em>x</em>³https://diagonalargument.com/wp-content/uploads/2020/05/circle-tangent-x-1-e1590183206999.pngcircle-tangent-x<em>x</em>²+(<em>y</em>–2)²=42020-08-08T14:39:06+00:00monthlyhttps://diagonalargument.com/2020/01/10/non-standard-models-of-arithmetic-14/https://diagonalargument.com/wp-content/uploads/2019/09/pa-models-diag-2.pngpa-models-diag2020-08-07T22:26:58+00:00monthlyhttps://diagonalargument.com/2019/09/22/non-standard-models-of-arithmetic-7/2025-02-01T02:13:48+00:00monthlyhttps://diagonalargument.com/2020/04/03/algebraic-geometry-jotting-3/https://diagonalargument.com/wp-content/uploads/2020/04/level-curves.jpglevel-curveshttps://diagonalargument.com/wp-content/uploads/2020/04/3petal-epsilon.png3petal-epsilonhttps://diagonalargument.com/wp-content/uploads/2020/03/4petal-branches.png4petal-brancheshttps://diagonalargument.com/wp-content/uploads/2020/03/3petal-branches-1.png3petal-brancheshttps://diagonalargument.com/wp-content/uploads/2020/03/3petal-branches.png3petal-brancheshttps://diagonalargument.com/wp-content/uploads/2020/03/3petal-2.png3petal$latex E(x,y)=(x^2+y^2)^2+3x^2y-y^3=0$https://diagonalargument.com/wp-content/uploads/2020/03/4petal-1.png4petal$latex F(x,y)=(x^2+y^2)^3-4x^2y^2=0$https://diagonalargument.com/wp-content/uploads/2020/03/3petal-1.png3petal$latex E(x,y)=(x^2+y^2)^2+3x^2y-y^3=0$https://diagonalargument.com/wp-content/uploads/2020/03/circles-1.pngcircleshttps://diagonalargument.com/wp-content/uploads/2020/03/cubics.pngcubics2020-06-26T14:50:40+00:00monthlyhttps://diagonalargument.com/2020/05/08/algebraic-geometry-jottings-17/https://diagonalargument.com/wp-content/uploads/2020/04/rose-intersections-h-mults.pngrose-intersections-h-multsres_x(<em>y</em>)=16<em>y</em>¹⁴(16<em>y</em>²-5)²2020-05-26T19:10:55+00:00monthlyhttps://diagonalargument.com/2020/05/06/algebraic-geometry-jottings-16/2020-05-26T19:10:02+00:00monthlyhttps://diagonalargument.com/2020/05/04/algebraic-geometry-jottings-15/2020-05-26T19:09:04+00:00monthlyhttps://diagonalargument.com/mathnotes/algebraic-geometry-jottings/2020-05-26T19:02:51+00:00weekly0.6https://diagonalargument.com/2020/04/01/algebraic-geometry-jotting-2/https://diagonalargument.com/wp-content/uploads/2020/04/projection-1.pngprojectionhttps://diagonalargument.com/wp-content/uploads/2020/04/chessboard.jpgchessboardhttps://diagonalargument.com/wp-content/uploads/2020/04/durer-perspective.jpgdurer-perspectivehttps://diagonalargument.com/wp-content/uploads/2020/03/rose-intersections-ix-2.pngrose-intersections-ix$latex E(ix,y)=(y^2-x^2)^2-3x^2y-y^3$ $latex F(ix,y)=(y^2-x^2)^3+4x^2y^2$https://diagonalargument.com/wp-content/uploads/2020/03/rose-intersections-hlines.pngrose-intersections-hlines<em>E</em>(<em>x</em>,<em>y</em>)=(<em>x</em>²+<em>y</em>²)²+3<em>x</em>²<em>y</em>–<em>y</em>³<br /> <em>F</em>(<em>x</em>,<em>y</em>)=(<em>x</em>²+<em>y</em>²)³–4<em>x</em>²<em>y</em>²2020-05-05T17:23:14+00:00monthlyhttps://diagonalargument.com/2020/04/17/algebraic-geometry-jottings-9/2020-05-04T20:11:07+00:00monthlyhttps://diagonalargument.com/2020/04/08/algebraic-geometry-jottings-6/2020-05-04T14:54:26+00:00monthlyhttps://diagonalargument.com/2020/04/30/weierstrasss-smackdown-of-dirichlets-principle/https://diagonalargument.com/wp-content/uploads/2020/04/weierstrass-example-1.pngweierstrass-example2020-05-04T13:05:56+00:00monthlyhttps://diagonalargument.com/2020/05/01/algebraic-geometry-jottings-14/2020-05-04T13:04:54+00:00monthlyhttps://diagonalargument.com/2020/04/27/algebraic-geometry-jottings-13/https://diagonalargument.com/wp-content/uploads/2020/04/rect-hyperbolas.pngrect-hyperbolashttps://diagonalargument.com/wp-content/uploads/2020/04/xy-hyperbolas.pngxy-hyperbolas2020-05-01T12:55:47+00:00monthlyhttps://diagonalargument.com/2020/04/26/wallpaper-groups/https://diagonalargument.com/wp-content/uploads/2020/04/escher-alhambrasketch2.jpgescher-AlhambraSketch2Escher: Alhambra Sketch2020-04-30T23:45:02+00:00monthlyhttps://diagonalargument.com/2020/04/15/algebraic-geometry-jottings-8/https://diagonalargument.com/wp-content/uploads/2020/03/two-ellipses-e1585328950234.pngtwo-ellipses<em>x</em>²+<em>y</em>² = 1<br />2<em>x</em>²+<em>y</em>² = 1 2020-04-29T18:50:32+00:00monthlyhttps://diagonalargument.com/2020/04/06/algebraic-geometry-jotting-4/https://diagonalargument.com/wp-content/uploads/2020/03/branch-branch.pngbranch-branch<p style="text-align:center;"><em>E</em>: <em>r</em> = –sin 3<em>t</em> <em>F</em>: <em>r</em> = sin 2<em>t</em></p>2020-04-29T18:49:37+00:00monthlyhttps://diagonalargument.com/2020/04/24/algebraic-geometry-jottings-12/2020-04-27T20:35:47+00:00monthlyhttps://diagonalargument.com/2020/04/22/algebraic-geometry-jottings-11/2020-04-27T20:35:09+00:00monthlyhttps://diagonalargument.com/2020/04/20/algebraic-geometry-jottings-10/2020-04-27T20:34:11+00:00monthlyhttps://diagonalargument.com/2018/07/03/under-construction/2020-04-24T14:59:30+00:00monthlyhttps://diagonalargument.com/2019/11/18/year-zero/2020-04-24T14:58:15+00:00monthlyhttps://diagonalargument.com/2020/03/20/a-fragment-from-the-archives/https://diagonalargument.com/wp-content/uploads/2020/03/atlantis-sinks.gifatlantis-sinkshttps://diagonalargument.com/wp-content/uploads/2020/03/nonagon.jpgnonagonhttps://diagonalargument.com/wp-content/uploads/2020/03/temple-2.jpgtemple-2https://diagonalargument.com/wp-content/uploads/2020/03/temple-1.jpgtemple-1https://diagonalargument.com/wp-content/uploads/2020/03/archive-fragment.jpgarchive-fragment2020-04-17T13:51:40+00:00monthlyhttps://diagonalargument.com/2020/04/13/algebraic-geometry-jottings-7/2020-04-17T13:49:12+00:00monthlyhttps://diagonalargument.com/2020/03/30/algebraic-geometry-jotting-1/https://diagonalargument.com/wp-content/uploads/2020/03/rose-intersect-at-inf-1-e1583352976896.pngrose-intersect-at-infhttps://diagonalargument.com/wp-content/uploads/2020/03/rose-intersections.pngrose-intersections<em>E</em>(<em>x</em>,<em>y</em>)=(<em>x</em>²+<em>y</em>²)²+3<em>x</em>²<em>y</em>–<em>y</em>³<br /> <em>F</em>(<em>x</em>,<em>y</em>)=(<em>x</em>²+<em>y</em>²)³–4<em>x</em>²<em>y</em>²2020-04-16T15:07:06+00:00monthlyhttps://diagonalargument.com/2020/04/08/algebraic-geometry-jotting-5/https://diagonalargument.com/wp-content/uploads/2020/03/auxiliary-curves.pngauxiliary-curvesAuxiliary Curves G and H2020-04-13T16:05:09+00:00monthlyhttps://diagonalargument.com/2019/06/22/non-standard-models-of-arithmetic-11/2024-05-20T19:03:58+00:00monthlyhttps://diagonalargument.com/2019/06/12/non-standard-models-of-arithmetic-10/2019-09-17T12:52:00+00:00monthlyhttps://diagonalargument.com/2019/05/10/non-standard-models-of-arithmetic-3/2019-09-16T20:57:09+00:00monthlyhttps://diagonalargument.com/2019/09/14/algorithmic-information-theory/2019-09-14T17:21:50+00:00monthlyhttps://diagonalargument.com/2019/05/29/simple-sets-and-the-recursion-theorem/2019-07-07T21:24:23+00:00monthlyhttps://diagonalargument.com/2019/05/06/the-lambda-calculus/2019-05-28T23:04:49+00:00monthlyhttps://diagonalargument.com/2019/05/13/friedbergs-enumeration-without-duplication/2019-05-28T22:58:32+00:00monthlyhttps://diagonalargument.comdaily1.02026-03-14T15:12:32+00:00