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I'm a student of mathematics in Germany.


Dec
14
asked Are the polynomial functions on $S^1$ dense in $C(S^1,ℂ)$?
Dec
14
asked Can $ℂ$ be viewed as a (nontrivial) field of fractions?
Dec
13
answered How to figure out Laurent series expansion for $z^2 \sin(1/(z+i))$?
Dec
13
answered Several questions on the mean value theorem?
Dec
13
answered Ring whose all ideals are double-sided is commutative?
Dec
10
answered Let $R=M_n(D)$, $D$ is a division ring. Prove that every $R-$simple module is isomorphic to each other.
Dec
6
answered showing the natural numbers exist from axioms (help with making sense of book)
Dec
5
answered Proof about direct sum of vector spaces
Nov
29
asked Why is every category in which all (even large) limits and colimits exist thin?
Nov
28
asked Is there a general notion of orientability, e.g. for the rationals?
Nov
24
answered Closedness and boundedness in metrizable topological spaces
Nov
24
answered Periodic functions and limit at infinity
Nov
24
answered Creating surjective holomorphic map from unit disc to $\mathbb{C}$?
Nov
21
answered Find remainder when $2^{30}\cdot 3^{20}$ is divided by $7$ without using calculator
Nov
15
answered is $f(x)=x^4 +x^3 +x^2 +x +1$ irreducible in $R=(\mathbb Z/7\mathbb Z)[x]$?
Nov
13
asked Instructive sources for arguing without elements
Nov
13
answered Show that there is an $R$-module homomorphism $\bar{h}$ such that $g \circ \bar{h} = h$.
Nov
11
answered Why is empty product defined to be $1$?
Nov
9
answered Union of convex hulls
Nov
9
answered Prove that a matrix and its inverse are over the same field