corpus.blog
41554 blogs · [ { "id": "01a0876e-947c-71c4-92d5-2f9737433ebd", "title": "Atomistic, but non-complete lattices", "url": "https://dominiczypen.wordpress.com/2026/02/13/atomistic-but-non-complete-lattices/", "published_at": "2026-02-13T10:13:00+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f9737a2782d", "title": "Selection principles: “Omega choose T” vs “Omega choose Gamma”", "url": "https://dominiczypen.wordpress.com/2025/08/18/selection-principles-omega-choose-t-vs-omega-choose-gamma/", "published_at": "2025-08-18T08:20:25+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f97389452dd", "title": "The Vietoris topology as a functor V : Top -> Top", "url": "https://dominiczypen.wordpress.com/2025/02/17/the-vietoris-topology-as-a-functor-v-top-top/", "published_at": "2025-02-17T09:13:48+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f9738a49d63", "title": "The Parity Principle: a pitfall in the use of Zorn’s Lemma", "url": "https://dominiczypen.wordpress.com/2024/12/23/the-parity-principle-a-pitfall-in-the-use-of-zorns-lemma/", "published_at": "2024-12-23T19:05:42+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f9738cfe7dc", "title": "Ramsey functions, property B, and the Axiom of Choice", "url": "https://dominiczypen.wordpress.com/2023/07/18/non-ramsey-functions-property-b-and-the-axiom-of-choice/", "published_at": "2023-07-18T14:44:49+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f97399c5bf5", "title": "A Funny Field", "url": "https://dominiczypen.wordpress.com/2021/01/06/a-funny-field/", "published_at": "2021-01-06T11:27:26+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f973a78997f", "title": "Making critical graphs as regular as possible", "url": "https://dominiczypen.wordpress.com/2019/12/17/making-critical-graphs-as-regular-as-possible/", "published_at": "2019-12-17T09:52:01+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f973b171da4", "title": "Generalizing the T_0 separation axiom", "url": "https://dominiczypen.wordpress.com/2018/10/11/generalizing-the-t_0-separation-axiom/", "published_at": "2018-10-11T12:03:50+00:00" }, { "id": "01a0876e-947c-71c4-92d5-2f973b1bfc76", "title": "Basics on towers on the natural numbers", "url": "https://dominiczypen.wordpress.com/2018/08/20/basics-on-towers-in-latex-omega/", "published_at": "2018-08-20T08:16:32+00:00" }, { "id": "01a0876e-947d-70fb-8478-cf5861169bb3", "title": "A definition of minor (in graph theory)", "url": "https://dominiczypen.wordpress.com/2018/06/02/a-definition-of-minor-in-graph-theory/", "published_at": "2018-06-02T13:39:32+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb5304cf0e", "title": "Any graph or its complement is connected", "url": "https://dominiczypen.wordpress.com/2018/04/09/any-graph-or-its-complement-is-connected/", "published_at": "2018-04-09T12:06:06+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb53ce05ad", "title": "Ode to ed (Unix standard text editor)", "url": "https://dominiczypen.wordpress.com/2017/09/12/why-i-started-using-the-editor-ed-on-a-daily-basis/", "published_at": "2017-09-12T13:52:33+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb5452edf2", "title": "Coloring connected Hausdorff spaces", "url": "https://dominiczypen.wordpress.com/2017/07/17/coloring-connected-hausdorff-spaces/", "published_at": "2017-07-17T11:09:11+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb54bc03d9", "title": "Ihm ging ein Licht auf: Grieche entdeckte vor 2500 Jahren die Sonne", "url": "https://dominiczypen.wordpress.com/2017/07/13/ihm-ging-ein-licht-auf-grieche-entdeckte-vor-2500-jahren-die-sonne/", "published_at": "2017-07-13T13:31:00+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb54c40cfb", "title": "Homogeneous spaces generalized – and an open problem", "url": "https://dominiczypen.wordpress.com/2016/08/13/homogeneous-spaces-generalized-and-an-open-problem/", "published_at": "2016-08-13T09:05:52+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb54dd0d82", "title": "Two notions of continuity in the space of natural sequences", "url": "https://dominiczypen.wordpress.com/2015/11/19/two-notions-of-continuity-in-the-space-of-natural-sequences/", "published_at": "2015-11-19T10:48:01+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb55815bb3", "title": "A reformulation of Hadwiger’s conjecture", "url": "https://dominiczypen.wordpress.com/2015/10/23/a-reformulation-of-hadwigers-conjecture/", "published_at": "2015-10-23T06:56:46+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb5581d3ec", "title": "Accumulation without converging subsequence", "url": "https://dominiczypen.wordpress.com/2014/10/13/accumulation-without-converging-subsequence/", "published_at": "2014-10-13T15:19:36+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb55cef17c", "title": "Measuring subsets of N", "url": "https://dominiczypen.wordpress.com/2014/06/18/measuring-subsets-of-n/", "published_at": "2014-06-18T07:10:55+00:00" }, { "id": "01a0c508-b967-7362-8211-42eb565011bf", "title": "Additive?", "url": "https://dominiczypen.wordpress.com/2014/06/06/additive/", "published_at": "2014-06-06T10:21:56+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd2b9f493", "title": "Exceptions to the Friendship Paradox", "url": "https://dominiczypen.wordpress.com/2014/03/17/exceptions-to-the-friendship-paradox/", "published_at": "2014-03-17T10:23:11+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd39fd302", "title": "Two-dimensional convergence", "url": "https://dominiczypen.wordpress.com/2014/02/18/two-dimensional-convergence/", "published_at": "2014-02-18T09:19:36+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd44c715b", "title": "A mathematical view on the notion of “median”", "url": "https://dominiczypen.wordpress.com/2013/12/30/a-mathematical-view-on-the-notion-of-median/", "published_at": "2013-12-30T10:22:21+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd47d0c37", "title": "Adventskranz-Rätsel", "url": "https://dominiczypen.wordpress.com/2013/12/17/adventskranz-ratsel/", "published_at": "2013-12-17T10:06:49+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd4c9c49e", "title": "Math facts with simple proofs that are still (somewhat) surprising", "url": "https://dominiczypen.wordpress.com/2013/12/17/math-facts-with-simple-proofs-that-are-still-somewhat-surprising/", "published_at": "2013-12-17T08:11:25+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd57e6908", "title": "Sometimes a maximality principle is true even if Zorn’s Lemma fails", "url": "https://dominiczypen.wordpress.com/2013/12/06/sometimes-a-maximality-principle-is-true-even-if-zorns-lemma-fails/", "published_at": "2013-12-06T10:16:56+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd5a2c2bc", "title": "On empty Hom-sets between graphs", "url": "https://dominiczypen.wordpress.com/2013/12/04/on-empty-hom-sets-between-graphs/", "published_at": "2013-12-04T09:06:40+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd66448ad", "title": "On the topological closure of the diagonal of a space", "url": "https://dominiczypen.wordpress.com/2013/12/03/on-the-topological-closure-of-the-diagonal-of-a-space/", "published_at": "2013-12-03T09:58:37+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd6669cfb", "title": "A universal property on groups", "url": "https://dominiczypen.wordpress.com/2013/11/19/a-universal-property-on-groups/", "published_at": "2013-11-19T08:48:20+00:00" }, { "id": "01a0c519-0791-7291-9e25-e17dd75acd16", "title": "Two definitions of connectedness in graphs", "url": "https://dominiczypen.wordpress.com/2013/08/14/two-definitions-of-connectedness-in-graphs/", "published_at": "2013-08-14T09:28:45+00:00" }, { "id": "01a0c523-faec-706d-9661-2f2b31718189", "title": "Basics on maps", "url": "https://dominiczypen.wordpress.com/2012/07/26/basics-on-maps/", "published_at": "2012-07-26T09:18:10+00:00" }, { "id": "01a0c523-faec-706d-9661-2f2b325a6079", "title": "Dreaming mathematics", "url": "https://dominiczypen.wordpress.com/2010/10/18/dreaming-mathematics/", "published_at": "2010-10-18T15:10:10+00:00" }, { "id": "01a0c523-faec-706d-9661-2f2b32de9f6b", "title": "(Least) upper bounds for order-preserving maps", "url": "https://dominiczypen.wordpress.com/2010/08/19/order-preserving-maps/", "published_at": "2010-08-19T12:18:50+00:00" }, { "id": "01a0c523-faec-706d-9661-2f2b335585f0", "title": "T_2 and compactness", "url": "https://dominiczypen.wordpress.com/2010/08/17/t_2_compactness/", "published_at": "2010-08-17T09:06:38+00:00" } ] posts Claim your blog
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2026

Atomistic, but non-complete latticesoriginal ↗
13 Feb 2026

2025

Selection principles: “Omega choose T” vs “Omega choose Gamma”original ↗
18 Aug 2025
The Vietoris topology as a functor V : Top -> Toporiginal ↗
17 Feb 2025

2024

The Parity Principle: a pitfall in the use of Zorn’s Lemmaoriginal ↗
23 Dec 2024

2023

Ramsey functions, property B, and the Axiom of Choiceoriginal ↗
18 Jul 2023

2021

A Funny Fieldoriginal ↗
6 Jan 2021

2019

Making critical graphs as regular as possibleoriginal ↗
17 Dec 2019

2018

Generalizing the T_0 separation axiomoriginal ↗
11 Oct 2018
Basics on towers on the natural numbersoriginal ↗
20 Aug 2018
A definition of minor (in graph theory)original ↗
2 Jun 2018
Any graph or its complement is connectedoriginal ↗
9 Apr 2018

2017

Ode to ed (Unix standard text editor)original ↗
12 Sept 2017
Coloring connected Hausdorff spacesoriginal ↗
17 Jul 2017
Ihm ging ein Licht auf: Grieche entdeckte vor 2500 Jahren die Sonneoriginal ↗
13 Jul 2017

2016

Homogeneous spaces generalized – and an open problemoriginal ↗
13 Aug 2016

2015

Two notions of continuity in the space of natural sequencesoriginal ↗
19 Nov 2015
A reformulation of Hadwiger’s conjectureoriginal ↗
23 Oct 2015

2014

Accumulation without converging subsequenceoriginal ↗
13 Oct 2014
Measuring subsets of Noriginal ↗
18 Jun 2014
Additive?original ↗
6 Jun 2014
Exceptions to the Friendship Paradoxoriginal ↗
17 Mar 2014
Two-dimensional convergenceoriginal ↗
18 Feb 2014

2013

A mathematical view on the notion of “median”original ↗
30 Dec 2013
Adventskranz-Rätseloriginal ↗
17 Dec 2013
Math facts with simple proofs that are still (somewhat) surprisingoriginal ↗
17 Dec 2013
Sometimes a maximality principle is true even if Zorn’s Lemma failsoriginal ↗
6 Dec 2013
On empty Hom-sets between graphsoriginal ↗
4 Dec 2013
On the topological closure of the diagonal of a spaceoriginal ↗
3 Dec 2013
A universal property on groupsoriginal ↗
19 Nov 2013
Two definitions of connectedness in graphsoriginal ↗
14 Aug 2013

2012

Basics on mapsoriginal ↗
26 Jul 2012

2010

Dreaming mathematicsoriginal ↗
18 Oct 2010
(Least) upper bounds for order-preserving mapsoriginal ↗
19 Aug 2010
T_2 and compactnessoriginal ↗
17 Aug 2010