集合論 | 数学の星 https://math-jp.net 数とはなにか、無限とはなにか Sat, 04 Feb 2023 01:44:17 +0000 ja hourly 1 https://wordpress.org/?v=6.9 https://math-jp.net/wp-content/uploads/2016/12/cropped-2015-06-06-18.34.04-1-2-32x32.jpg 集合論 | 数学の星 https://math-jp.net 32 32 集合の集合っていったいどんな集合？ https://math-jp.net/2020/10/21/set-of-set/ Wed, 21 Oct 2020 09:07:36 +0000 https://math-jp.net/?p=4216 有限集合の例でべき集合を求めるよ https://math-jp.net/2019/10/20/yuugen-set-power/ https://math-jp.net/2019/10/20/yuugen-set-power/#comments Sun, 20 Oct 2019 05:15:25 +0000 https://math-jp.net/?p=4137 https://math-jp.net/2019/10/20/yuugen-set-power/feed/ 1 有限集合についてわかりやすく書くよ https://math-jp.net/2019/10/20/yuugen-set-mugen/ Sun, 20 Oct 2019 02:21:52 +0000 https://math-jp.net/?p=4132 １＋１＝２の証明が難しい理由 https://math-jp.net/2018/05/08/1-plus-1-equal-2-proof/ Mon, 07 May 2018 15:27:09 +0000 https://math-jp.net/?p=3731 ハムサンドイッチの定理 https://math-jp.net/2017/06/22/ham-sandwich-theorem/ https://math-jp.net/2017/06/22/ham-sandwich-theorem/#respond Wed, 21 Jun 2017 18:31:22 +0000 https://www.math-jp.net/?p=2478 https://math-jp.net/2017/06/22/ham-sandwich-theorem/feed/ 0 公理的集合論から順序数(注意！本当に駄文でゴメン) https://math-jp.net/2017/05/26/axiomatic-set-theory/ https://math-jp.net/2017/05/26/axiomatic-set-theory/#respond Fri, 26 May 2017 13:47:51 +0000 https://www.math-jp.net/?p=2391 https://math-jp.net/2017/05/26/axiomatic-set-theory/feed/ 0 デデキント切断で考察すべき所 https://math-jp.net/2017/05/14/dedekind-cut/ https://math-jp.net/2017/05/14/dedekind-cut/#comments Sun, 14 May 2017 03:23:05 +0000 http://www.math-jp.net/?p=2268 https://math-jp.net/2017/05/14/dedekind-cut/feed/ 2 対角線論法を応用して極限が0の数列を0に収束させない https://math-jp.net/2017/04/25/converge-diagonal-argument/ https://math-jp.net/2017/04/25/converge-diagonal-argument/#comments Mon, 24 Apr 2017 22:48:30 +0000 http://www.math-jp.net/?p=2176 https://math-jp.net/2017/04/25/converge-diagonal-argument/feed/ 4 「数直線上の点を実数と対応させても隙間だらけ」が正解 https://math-jp.net/2017/04/19/post-2115/ https://math-jp.net/2017/04/19/post-2115/#comments Tue, 18 Apr 2017 23:11:18 +0000 http://www.math-jp.net/?p=2115 https://math-jp.net/2017/04/19/post-2115/feed/ 1 可能無限の代表例を挙げる、数について考えるために。 https://math-jp.net/2017/04/17/possible-infinity/ https://math-jp.net/2017/04/17/possible-infinity/#respond Mon, 17 Apr 2017 14:03:17 +0000 http://www.math-jp.net/?p=2105 https://math-jp.net/2017/04/17/possible-infinity/feed/ 0