Summer is coming soon

HP（ブログ）の記述は，完成後に読み返してみて「これも追加したい」と思うことがよくあります．5.2節のU_systemの解説に関する項目に関しても，完成後に「Pareschiらの運動量とエネルギの厳密保存の練習問題 (課題)」を加えるべきだと思いつき，早速，それを追加しました．また，5.1節の「Fortran77固定形式３時間マスター」は，元々，大学のゼミで使っていた「Fortran２時間マスター」というA４の２枚の資料を，４枚に増やして充実させ「３時間マスター」と銘打ったもので，Fortranの文法を簡潔に網羅しています（日本語版のみ）．最近はプログラム言語も増えてきて，もうFortranの書籍は，大きな本屋や大きな図書館の開架スペースでも１冊見つかればいい方です．私と同年代の先生が，学生がFortranを使っているのを見て「まだFortranなんかを使っているの？」と言っていましたが，私からすれば「あんただって若いころはFortranのお世話になってプログラミングを学んだんでしょ．」とその先生に言ってやりたい．もう十分老人となった我が身としては，多少楽しいことも書いてみたいと，5.2節には，いくつかの冗長話（双線形補間と巻きす，U_systemの名前の由来，森鴎外の小説）を交えて解説しています．笑ってくれる人がいたら大成功です．

I often read the HP (blog) description after completing it and think, “I want to add this too.” Regarding the item about the explanation of U_system in section 5.2, I thought that I should add “Pareschi et al.’s exercise (task) on strict conservation of momentum and energy” after completing it, and I added it immediately. Also, “Mastering Fortran77 Fixed Format in 3 Hours” in section 5.1 was originally a two-page A4 document called “Mastering Fortran in 2 Hours” that was used in a university seminar, but it was expanded to four pages and titled “Mastering Fortran in 3 Hours,” and it covers Fortran grammar concisely (Sorry. Only available in Japanese). Recently, the number of programming languages ​​has increased, and now you are lucky if you can find just one book on Fortran even in the open shelves of a large library or a large bookstore. A teacher of the same generation as me saw students using Fortran and asked, “Are you still using Fortran?” I would like to say to him, “Even you learned programming with the help of Fortran when you were young.” Now that I’m quite an old man, I wanted to write something a little fun, so in Section 5.2 I’ve included some redundant information (bilinear interpolation and rolling mats, the origin of the name U_system, and Mori Ogai’s novels) to explain things. If it makes some people laugh, then I’ll be very successful.