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1h
answered Find a close form expression for $f(x)$
6h
answered Epsilon delta theorem proof
8h
asked How to pronounce “$ a:b=c:d$” in English?
19h
answered Random points on a sphere — expected angular distance
2d
answered $ \lim_{x\rightarrow a} f(x)= \lim_{x\rightarrow a} [f(x)]$ then at $x=a$ is there a maxima or minima?
2d
answered $f(x)=\sum_{k=0}^\infty c_kx^k$ converges for $|x|<R$ with $R>0$, $\exists x_n\ne0$ s.t. $x_n\to0$, $f(x_n)=0$ $\forall n$, then $c_k=0$ $\forall k$.
2d
answered What is an axiom in layman's terms?
2d
answered Are 0 and -1 the only rational periodic solutions of $z_{n}\equiv z_{n-1}^{2}+c$?
2d
answered Why is $R((X))$ defined as follows?
2d
answered Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent?
May
2
answered Show that $\sin(x) > \ln(x+1)$ for any $x \in (0,1)$
May
1
answered Is $\Bbb Q[x]/(x^2+x)$ isomorphic to $\Bbb Q[x]/(x^2-x)$?
May
1
answered What is the logic underlying this proof?
May
1
answered Prove that $a . g = g^{-1}.a$ and $g . a = a . g^{-1}$ hold for any group and any action defined.
May
1
answered How to differentiate something with u and x?
Apr
30
answered Is there a way to see if $\alpha \in \mathbb{C}$ is constructible at a glance?
Apr
30
answered Minimal 4-regular planer graph
Apr
30
answered How to convert arccos to arctan?
Apr
30
answered Prove that there exists no prime
Apr
29
answered Find all function that satisfy $(f(x) + xy) \cdot f(x - 3y) + (f(y) + xy) \cdot f(3x - y) = (f(x + y))^2$