My specailisties are math, math and math.
More specifically, I understand the fundemnal theories of these subjectes: logic, algebra, calcus, differential equations, geomoetry, trigonomotry, probablity, statistics, combinatorics, game theory, finance, accounting, ecomonics, excel, R software, decision analysis, game theory, and mathematical proof.
Oh, and I can also help with other easy math like Graph theory.