There are several native Russian speakers frequenting this forum who would probably summarize a link for you better than google translate. In case it makes your life easier.

I'll keep that in mind, thanks.

As for the language vs math pools, my experience is that they are unconnected, except for the obvious bottleneck of having to divide your finite learning time between them.

My question more generally is, how far can you divide this? I recognised some time ago that even when I literally can't read mathematical formulae anymore, I am perfectly able to learn a language or read prose except for the slight exhaustion. Could I learn math, a language and after that some biology? Where is the limit, except for the obvious time constraints? Should learning of math be interrupted by short burts of learning a language or by complete rest? And so on.