Context: I'm taking multivariable calculus this semester and my professor takes exercises from Problems in Mathematical Analysis by Demidovich - a book from a few decades ago, written by russian mathematicians. The problems in this book are of much higher difficulty than, say, Thomas Calculus (probably the most used textbook for calculus courses). I'm finding the course pretty difficult and it would be useful to have a solutions manual. However, there isn't any official one, so I thought I'd ask here if anyone has worked on the book and has solutions to the problems.
Thanks