[aanastasov]

The small yellow book might have already fallen out of fashion. I graduated from a math high school in Bulgaria about 10 years ago, and I vaguely remember the yellow book being referred to as if it was popular during the stone age.

[raninepaths]

Is it available in english? Or any other equivalent book in english?

[akiselev]

It's not really comparable to the yellow book and its meant as a glossary for an older audience, but I've found Mathematical Notation: A Guide for Engineers and Scientists [1] to be useful, especially for reading CS and ML papers.

[1] https://www.amazon.com/Mathematical-Notation-Guide-Engineers...