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David Hemmer

I can answer almost any question from undergraduate mathematics courses.

Ahmed Salami

I can provide good answers to questions dealing in almost all of mathematics especially from A`Level downwards. I can as well help a good deal in Physics with most emphasis directed towards mechanics.

Janet Yang

I can answer questions in Algebra, Basic Math, Calculus, Differential Equations, Geometry, Number Theory, and Word Problems. I would not feel comfortable answering questions in Probability and Statistics or Topology because I have not studied these in depth.


I can answer any questions from the standard four semester Calulus sequence. Derivatives, partial derivatives, chain rule, single and multiple integrals, change of variable, sequences and series, vector integration (Green`s Theorem, Stokes, and Gauss) and applications. Pre-Calculus, Linear Algebra and Finite Math questions are also welcome.

Chen Min

All the conceptual questions, pure math & basic stats alike I am good at answering your algebra (including logarithm, functions, trigonometry) and geometry questions. I can also provide to you a firm understanding into basic calculus and other mathematical ideas and concepts. You can either ask questions in English or Chinese. Physics Qns that require rigorous math are also welcomed Important:Please avoid asking me questions related to economics.After all, I am only a secondary school student

randy patton

college mathematics, applied math, advanced calculus, complex analysis, linear and abstract algebra, probability theory, signal processing, undergraduate physics, physical oceanography

Paul Klarreich

I can answer questions in basic to advanced algebra (theory of equations, complex numbers), precalculus (functions, graphs, exponential, logarithmic, and trigonometric functions and identities), basic probability, and finite mathematics, including mathematical induction. I can also try (but not guarantee) to answer questions on Abstract Algebra -- groups, rings, etc. and Analysis -- sequences, limits, continuity. I won't understand specialized engineering or business jargon.

Scott A Wilson

I can answer any question in general math, arithetic, discret math, algebra, box problems, geometry, filling a tank with water, trigonometry, pre-calculus, linear algebra, complex mathematics, probability, statistics, and most of anything else that relates to math. I can also say that I broke 5 minutes for a mile, which is over 12 mph, but is that relevant?

Clyde Oliver

I can answer all questions up to, and including, graduate level mathematics. I am more likely to prefer questions beyond the level of calculus. I can answer any questions, from basic elementary number theory like how to prove the first three digits of powers of 2 repeat (they do, with period 100, starting at 8), all the way to advanced mathematics like proving Egorov's theorem or finding phase transitions in random networks.

Recent Answers

2017-01-13 linear algebra:

I think the trace of X should be zero. Here's my derivation:    Traces have some simple and useful properties, such as (for a matrices A and B)    1. Tr(A +B) = Tr(A) + Tr(B)    2. Tr(A) = Tr(A^t)    3

2017-01-02 linear algebra:

For A and B are in Mnxn, the form    S = AB - BA,    is called a commutator, made famous by the Heisenberg Principal (just FYI).     As you probably know, the dimension of the vector space of matrices

2016-12-07 abstract algebra:

I can give you a quick answer , assuming you know a bit about permutations and conjugates. Let C be the group of permutations that commute with (1,3,5,7,9). The number of conjugates of (1,3,5,7,9) is the

2016-12-03 Randomly dividing a number:

I used a spreadsheet (by Excel).  Note that is the value is in ' ', I only input what is between the ' '.  If the value is preceded by an equal sign, that is what I put in the cell {without the period

2016-11-29 Width Follpw-up:

area of metal = y  area of wood = x-y  y:(x-y) = 25:39  39y = 25(x-y) = 25x - 25y  64y = 25x  y = (25/64)x  y = √((25/64)x) = (√25/√64)√x = (5/8)x    w = (x - y)/2

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