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Mathematics
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darkside
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4
How do I determine all the endomorphisms of the identity functor $\text{id}_{\text {Grp} }: \text {Grp}\rightarrow \text {Grp}$?
Oct 9, 2023
4
$Ham(M, \omega)$ acts transitively on $(M,\omega)$
Mar 21
3
A lemma to the escape lemma (Lee' Intro to smooth manifolds Lemma 9.19)
Dec 5, 2023
2
Is $\partial_k g_{ij}=\partial_j g_{ik} $?
Feb 19
2
computing fixed points of a toric action
May 4
2
How do I show that the region {r > 2m} of the Schwarzschild spacetime is globally hyperbolic?
Apr 15
2
If $ρ_{AB} ∈ D(H_A \otimes H_B)$ such that $ρ_{A}$ is pure. $\implies ρ_{AB} = ρ_{A} \otimes ρ_{B}$
Feb 22
2
Proving $\gamma \sim \delta (\gamma'(0)=\delta'(0))\iff (\varphi \circ \gamma)'(0) = (\varphi \circ \delta)'(0) \in \Bbb R^m $
Oct 12, 2023
2
$M_1 \oplus M_2$ is projective $\iff M_1$ and $M_2$ are both projective
Nov 20, 2023
2
$ T^*$ is commutative $\iff R^*=\{1\}$ where $T=\{\begin{pmatrix}a & b \\ c & d \end{pmatrix} \in M(2,R)|c=0\}$
Nov 15, 2023