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Maik Pickl
  • Member for 6 years, 4 months
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11 votes

Why is some power of a permutation matrix always the identity?

5 votes
Accepted

Why can't we use the law of cosines to prove Fermat's Last Theorem?

5 votes
Accepted

Partition of unity from RCA Rudin

4 votes

Inverse limit of finite sets with surjective maps has surjective projection?

4 votes
Accepted

Is a complement finite topological space compactly generated?

4 votes
Accepted

Give an example of a ring of cardinality 8 such that there are exactly 6 zero divisors

4 votes
Accepted

The inductive construction of a CW complex.

4 votes
Accepted

Prove: $h \in T_xM \iff \operatorname{dist}(x+\epsilon h,M) = o(\epsilon)$

4 votes
Accepted

injective linear transformation basis.

3 votes

If the orbit space is Hausdorff, must the action be proper?

3 votes
Accepted

Show that $\{ \rho(u_n,v_n)\} \rightarrow \rho(u,v)$

3 votes
Accepted

morphism of $C^{\infty}(M)$ algebra

3 votes
Accepted

Linear transformations on finite dimensional spaces

3 votes

Proof about characteristic polynomial

3 votes

Prove or Disprove: there is only one ring homomorphism $f:\mathbb{R} \rightarrow \mathbb{C}$

3 votes
Accepted

Every symmetric bilinear form has a orthogonal basis

2 votes
Accepted

If dim$(V)=n<\infty$, then $V^{\infty}_{p} = V_{p^n}$

2 votes

Show that $T$ has an invariant subspace of dimension $j$ for each $j=1,2,\ldots \dim V$.

2 votes
Accepted

Corollary of Schur's Lemma - why abelian

2 votes
Accepted

Why does $y$ go to $0$ faster than $x$?

2 votes
Accepted

Linear transformation defined by an $m$ by $n$ matrix

2 votes

How to create a counter example of a matrix with non orthogonal eigenvector?

2 votes

Functorial Morphism in Top / Topological Question

2 votes
Accepted

An open set that has no volume

2 votes
Accepted

Any basis of a $C_2$ space admits a countable subcollection as a basis

2 votes
Accepted

Liouville's Theorem Applications

2 votes

Proof similarity transformations are bijective.

2 votes
Accepted

Prove that $Av_i \bullet Av_j = v_i \bullet v_j$, $\forall i,j$

2 votes
Accepted

Understanding a proof of Schröder-Bernstein theorem

2 votes

Let $G$ be the set of all functions $g : ℕ \to \{0,1\}$. Prove that $G$ is uncountable.