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The Hermite function, which cannot be expressed by a normal analytic function (except for the integral exponential), is defined on an infinite interval. This is similar to the sum of a series.

Yes, I remember something like that.
https://ru.wikipedia.org/wiki/%D0%98%D0%BD%D1%82%D0%B5%D0%B3%D1%80%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9_%D1%81%D0%B8%D0%BD%D1%83%D1%81

Oh, right. Well, I completely forgot about the integral sine, but luckily, the sine can be expressed in terms of exponentials...

But probably this Lorenzo Mascheroni sat and calculated it manually using some numerical method, and then realized that it would approach pi/2 as it goes to infinity. A riddle to test one's breadth of knowledge.

No. These integral sines and exponentials are calculated through the sum of a series, of course, but in this specific case, it's not necessary. Here, I even looked up a solution on Habr: https://habrahabr.ru/post/146140/ (look from "The tale begins to unfold"). ---------- Oh, and it can be obtained normally through the Dirichlet integral. But I've forgotten the Dirichlet integral too much to come up with this solution yesterday...

1=1
1!=1
It's not growing, for some reason... :(

Okay, since no one seems to care, here's the question.

Where did the word "sharomiznik" come from in the Russian language in the 19th century?

- My dear friend, I haven't eaten anything all day...
- Oh, you rascal. So, why did you burn Moscow if Kutuzov defeated you? Never mind, come in, my Akulina just made a big pot of shchi, you won't find anything like it in your France...

Make a wish :D

Alright, here's another puzzle from my favorites.

Here's what I came up with:
A - English and French, Frenchman
B - German and Russian, German
C - English and Russian, Englishman
D - Russian and French, Russian

Make a wish.

I'm not good at guessing; I just wanted to solve this puzzle...

Alright, then let anyone who wants to make a wish.