▽hiroyukikojimaの日記
●04/02 14:27
2025-04-01D加群と触れあえる本ｱﾏｿﾞﾝ 加群十話柏原先生がｱｰﾍﾞﾙ賞を受賞した｡数学の伝統的な賞であるﾌｨｰﾙｽﾞ賞は日本人3人が受賞しているけど､賞金額がﾉｰﾍﾞﾙ賞に匹敵するｱｰﾍﾞﾙ賞は日本人では初めてなので大変めでたいことだ｡受賞理由は｢D加群という理論を構築し､数学の新しい道を切り開いた｣とのこと｡さて､｢D加群｣とはなんだろうか｡今回は､それと｢触れあえる｣本を紹介しよう｡あくまでも｢触れあえる｣だけで理解できるとは言ってないことに注意してほしい｡紹介する本は､堀田良之『加群十話』朝倉書店だ｡この本は奇遇にもつい最近読んだ｡動機は､代数幾何やｺﾎﾓﾛｼﾞｰの理解のためには加群は避けて通れないから｡加群十話: 代数学入門 (すうがくぶっくす 3)作者:堀田 良之朝倉書店Amazonこのところ､ぼくは新しい本を執筆中で､その作業が佳境に入っているので､ﾌﾞﾛｸﾞを

▽Asymmetrical Information
●03/28 02:18
Read the detailed attack plans that Trump’s advisers shared in the Signal group chat.

▽Economics Lovers Live
●03/03 11:30
2025-03-03伝統的な左翼的視点からの経済学批判へのﾉｱ･ｽﾐｽの反論ﾉｱ･ｽﾐｽの｢伝統的な左翼的経済学批判への反論｣を書いた記事からの引用｡自分の備忘録｡元記事https://www.bloomberg.com/view/articles/2018-04-25/critics-of-economics-are-dwelling-in-the-past一部抜粋A third mistake comes when Reed asserts that “Power relations in the labour market go unexamined.” This ignores several recent high-profile papers that have illustrated how concentrated labor markets pay lower

▽Marginal Revolution
●02/25 05:43
Grok 3 on the Syrians in Germanyby Tyler Cowen February 24, 2025 at 1:57 pm inCurrent AffairsData SourceLet’s dive into the latest evidence on how the roughly one million Syrian migrants are faring in Germany, focusing on employment, crime rates, and any other relevant data that sheds light on their integration. As of today, February 24, 2025, the picture is a mix of progress and challenges, s

▽Ideas
●02/04 08:48
My SubstackI now have a substack and have been posting regularly to it; I am keeping this blog up for the archives and as a link to my substack posts....