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Samuel Adrian Antz's user avatar
Samuel Adrian Antz's user avatar
Samuel Adrian Antz's user avatar
Samuel Adrian Antz
  • Member for 2 years, 2 months
  • Last seen this week
  • University Augsburg, Germany
7 votes
Accepted

Criteria for Hausdorff

7 votes
Accepted

Subbundle of a pullback is not the pullback of a subbundle

6 votes
Accepted

Locally path connected implies connected if and only if path connected

5 votes

If $G=AB$ and $|G|=|A||B|$, then $G=A^{-1}B$.

5 votes

Connected set which is no-where path connected

4 votes

Lifts of rotations in $\operatorname{SO}(3)$ to rotations in $\operatorname{SU}(2)$

4 votes
Accepted

Lax-Milgran theorem with the Poisson equation

4 votes

boundary of a simply connected, compact manifold with boundary

3 votes
Accepted

Dense subset of $S^{n-1}$ with antipodal complement

3 votes

Is there a smooth real function on some open interval containing x=a such that its power series expansion at x=a has zero radius of convergence?

3 votes

Is there a function whose graph intersects every tangent line at exactly 2 points?

3 votes

Bilinear form Find q $\in\ V$ such that $\phi(p)=\psi(p,q)$ for all $p\in V$

2 votes
Accepted

Is true that $f:∐_{σ∈Σ}X_σ⟶X$ is continuous iff $f∘ι_σ$ is continuous when $ι_σ$ is the standard embedding of $X_σ$ into $∐_{σ∈Σ}X_σ$?

2 votes
Accepted

How many automorphisms does $C_{n}$ have?

2 votes

How to prove an operator is self adjoint on $P_n(R)$

2 votes
Accepted

Does locally compact and $\sigma$-compact non-Hausdorff space imply hemicompact?

2 votes
Accepted

prove that $\operatorname{Int}(A \cap B)= \operatorname{Int}(A) \cap \operatorname{Int}(B)$

2 votes

Show that the subgroup $K = \{g^{-1}h^{-1} g h | g, h \in G\}$ is a normal subgroup of a group G

2 votes
Accepted

Obtain a function by it's even or odd part

2 votes
Accepted

If $p$ is prime, prove that there exists an injective ring homomorphism $\phi:\mathbb{F}_{p^{n}}\longrightarrow\mathbb{F}_{p^{m}}$ iff $n|m$.

2 votes

Function where second derivative is equal to reciprocal squared

2 votes

clarifiation about topological spaces and more

2 votes
Accepted

Why the triangle diagram commutes because of naturality

2 votes
Accepted

If $C(c,-)$ maps all morphisms to isomorphisms, what can we say about $c$?

2 votes

Cone $CX$ is always contractible , homeomorphisms with unit ball

2 votes
Accepted

Hausdorff Dimension of an Intersection

2 votes

Let be $X$ a space with dense subset $D$. If $Y$ is a Hausdorff space and $f,g:X\to Y$ are continuous maps so that $f=g$ on $D$, then $f=g$ on $X$.

2 votes
Accepted

Can $f:M^n \rightarrow N^m$ be an immersion if $m<n$

1 vote

Coherence in closed monoidal categories

1 vote

Question on Garling Approach to Galois Theory