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Sep
12
reviewed Leave Open A bijection of Cartesian products
Sep
10
reviewed Leave Open how do you call a function that breaks down on y?
Sep
10
reviewed Close Level of math required to start research?
Sep
10
reviewed Leave Closed Is the $\sum\sin(n)/n$ convergent or divergent?
Sep
10
reviewed Leave Closed Limit of the nested radical $\sqrt{7+\sqrt{7+\sqrt{7+\cdots}}}$
Sep
10
reviewed Leave Closed Why is $dy dx = r dr d \theta$
Sep
10
reviewed Leave Closed How to find the equation of a graph with given coordinates?
Sep
10
reviewed Leave Closed If g(f(x)) is one-to-one (injective) show f(x) is also one-to-one (given that…)
Sep
10
reviewed Leave Closed Is square root of an integer, either an integer or an irrational number, but never (non-integer) rational?
Sep
10
reviewed Leave Closed Weird E letter? (sigma)
Sep
10
reviewed Leave Closed Sum of n consecutive numbers
Sep
10
reviewed Leave Closed Puzzle - where did the extra dollar come from?
Sep
10
reviewed Leave Closed How come the number $N!$ can terminate in exactly $1,2,3,4,$ or $6$ zeroes but never $5$ zeroes?
Sep
10
reviewed Leave Closed Best Fake Proofs? (A M.SE April Fools Day collection)
Sep
10
reviewed Leave Closed Which one is preferred: $r2^m$ or $2^m r$?
Sep
10
reviewed Leave Closed A simple yet confusing puzzle - Fake money involved!
Sep
10
reviewed Leave Closed The union of kernels is a proper subspace
Sep
10
reviewed Reopen Why is it important that a basis be orthonormal?
Sep
10
reviewed Leave Closed What is the most number of regions that 9 lines can cut the plane into
Aug
31
reviewed Reviewed Want to clarify whether I am correct or not, $\Phi(G) \subseteq \Phi(H)$?