K. Stm.

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I'm an undergraduate student of mathematics in Germany, currently working on my bachelor thesis.


62 Answers

newest activity votes
8
Proof of triangle inequality
7
Existence of whole number between two real numbers $x$ and $x +1$?
7
Show that $f$ cannot have infinitely many zeroes in $[0, 1]$.
7
Matrix notation differences
5
How I can prove that: If $X$ is compact, then any map $f\colon X \to Y$ is proper?
5
Solve $\dfrac{1}{1+\frac{1}{1+\ddots}}$
4
Help explaining the sign of a permutation
3
Domain whose boundry has non zero volume.
3
Proving that an injective function is bijective
3
Prove that every isometry on $\mathbb{R}^2$ is bijective
3
Invertible Adjoint matrix
3
which of the following sets are countable
3
Two questions for Hermitian matrices.
3
Continuous function from $[0,1]$ to $[0,1]$ whose fibers are infinite
2
Proof: $f: A \to B$, if $f$ is bijection then $\forall a\in B \exists ! b\in A (f(b) = a) $
2
Simple onto functions
2
Riemann surface arising as a quotient of the upper half-plane.
2
Is $\sqrt{-1}$ positive or negative?
2
If $ad-bc\ne0$ then the map given by $z\mapsto\frac{az+b}{cz+d}$ is non-constant
2
a question on discrete topology on uncountable space
2
Find lim sup $x_n$
2
Subgroup of $\mathbb{Z} \oplus \mathbb{Z}$ that is not a subring?
2
Reflection of a line on complex plane
2
Extending a real vector space into a complex vector space using a linear map
2
Computation with scalar product
2
Why are all polynomials with real roots factorizable?
2
Product of sum expression
1
Problem on multiplicative subsets 1
1
What is the precise statement of the theorem that allows us to “localize” our knowledge of derivatives?
1
The abelian group G is n-divisible if (n,|G|)=1
1 2 3