Reddit mentions of Handbook of Mathematics

Mathematical English and German are structurally very similar and linguistically speaking rather repetitive. In my opinion they're among the simplest Fachsprachen.

For example there are these conditional constructions ("let x equal zero, then..." or "Sei x gleich 0, dann...") that open most proves and appear multiple times on each page. See them once to know them all.

Concerning vocabulary, you can translate most things literally if it's not even the same word. Riemann Integral is Riemannsches Integral and Eigenvalues are Eigenwerte.

If your skills are above, say, eleventh grade (i. e. you are familiar with the concept of proofs and mathematical English in general), buy any German math book and just read it. I'd recommend a formulary. If you think you still need a reference, buy two versions of one that has been translated in both languages.

Bronshtein, Handbook of Mathematics or Bronstein, Taschenbuch der Mathematik shouldn't be too expensive and perhaps it's even worth to own it twice because it's so comprehensive and useful.

My lexicon for mathematics has it's origins in the USSR and was translated in the former GDR. Every engineering student had this relative cheap lexicon in the format of the bible with more than 900 pages. Yes, it the bible for scientists and engineers!

http://www.amazon.com/Handbook-Mathematics-I-N-Bronshtein/dp/3540434917

Kudos to the Russian culture for this amazing work!!!!

I would like to make a travel to the Russian far east (Sakhalin). Siberia must be gorgeous. Sadly I haven't the money for such an adventure.

I've read on European forums Russians have a great heart, which makes me more curious.

Quadratic equations (like x^2 -5x=8), systems of linear equations (5x+y=7 and 2x-3y=9), triangle geometry, trigonometry (sin(x), cos(x) stuff), derivation should be all accessible for a motivated enough person at your age. Find a high-school or even freshman college textbook, and try to work through it. It doesn't have to be the best textbook at this point.

When I was in 7th or 8th grade, my father gave me a math handbook, which included material up to basic college level (that one doesn't exist in English, but there must be better ones anyway). Something like the famous Bronshtein will keep you occupied for a long time; you won't (yet) understand large parts of that, but don't worry, just concentrate on the simpler parts. It's probably better (and much easier) if you also find a normal textbook; the handbooks are intended primarily as references, not learning materials.

maybe this

http://www.amazon.com/Handbook-Mathematics-I-N-Bronshtein/dp/3540434917

it's really shitty and not suitable to actually learn from it, but contains information on lots of topics.

you should really just get one of the handful of standard textbooks on each topic.

if you really want a series of multiple books, most of the publishers have books on all topics, by different authors though, as it's unlikely one author will cover all of math. there's bourbaki but this is also a group of people under a pseudonym.

repeated information is really not a problem at all. usually you will benefit from having something repeated. if it's really trivial just skip it.