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Jul
19
answered Symbol for set of strictly positive real numbers?
May
7
answered Is an $R$-module $A$ a module over the image of a homomorphism $f:R\rightarrow{f(R)}?
May
2
answered Split extension for semi-direct and direct products. Can a split extension be exact?
Apr
14
answered Prove that $\mathbb{Q}(r+s\sqrt{t})=\mathbb{Q}(\sqrt{t})$.
Apr
11
answered At what points of r in real number is f continuous?
Mar
27
answered Let f(x),g(x) be complex polynomials, if f(x) | g(x) and g(x) | f(x) then..
Jan
11
answered Reverse Product Rule ODE
Jan
11
answered Why are primes considered to be the “building blocks” of the integers?
Jan
10
answered How to prove that a set spans a plane
Jan
17
answered If $X$ and $Y$ are objects of $\mathrm{Set}$, is there any reason not to regard $\mathrm{Hom}(X,Y)$ as an object, too?
Jul
28
answered Help to prove bijection between subset of $S^2$ and $\mathbb{R}^2$
Jul
27
answered Find equation that represents $m$ as the subject
Jul
27
answered What character can replace word “let” in proofs?
Jul
23
answered Is this infinite series a Fourier series?
Jul
22
answered How many 32-bit strings have fewer 1s than 0s?
Jul
18
answered Definition of a nilpotent group.
Jul
17
answered The product of finitely many cyclic groups is cyclic
Jul
16
answered Proof that for any interval (a,b) with a<b in the real numbers contains both rational and irrational numbers?
Jul
15
answered Determine whether the function is a linear transformation:
Jul
15
answered Show that every finite group of order $n$ is isomorphic to a group consisting of $n\times n$ permutation matrices.