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Danu's user avatar
Danu's user avatar
Danu
  • Member for 10 years, 6 months
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12 votes

What is the name of this pattern? Is there a name?

9 votes
Accepted

Why do finite exact sequences frequently begin and end with $0$?

6 votes

Terminology of adapted coordinate charts

5 votes
Accepted

Every Riemann Surface has a countable basis for its topology

5 votes
Accepted

What are these quotient spaces homeomorphic to?

4 votes

Does calculus of variations have a close connection to Feynman's ''differentiation under the integral sign''?

4 votes

What is a primitive notion and an Axiom?

4 votes
Accepted

How can I geometrically understand the fundamental group of the 1-skeleton of the unit cube?

4 votes

What does "smoothly compatible" mean?

4 votes
Accepted

Homotopy type of the subspace $Q=\{[z_0,...,z_n] \in \Bbb CP^n : z_0^2+...+z_n^2=0 \}$ of the complex projective space

3 votes

How do I see that $\mathbb{CP}^2$ is not the boundary of a compact smooth $5$-manifold?

3 votes
Accepted

Space of all complex structures on $V$ is homotopy equivalent to the space of (linear) symplectic forms on $V$

3 votes

How can it be shown that $\mathrm{Aut}(\mathbb{C})=\{f\,|\,f(z)=az+b,a\neq 0\},$ is defined as bijective ...

2 votes

Imagining $S^1$ with antipodal points identified

2 votes

Series solution to a 2nd order linear ODE

2 votes

One-to-one correspondence of a set within a set

1 vote
Accepted

Statistics of the product of two white noise Fourier amplitudes

1 vote
Accepted

Line integrals; How to set $t$ boundary?

1 vote
Accepted

Matrix translation by (1x2) vector

1 vote

Standard topology generated by the basis whose elements are open intervals of rationals

1 vote

How to finish? Connectedness

1 vote
Accepted

$GL(n,\mathbb R)$ and $SL(n,\mathbb R)\times \mathbb R^\ast$

1 vote
Accepted

Revisit the problem " Image of open set through linear map "

1 vote
Accepted

Does a presheaf whose étalé space is Hausdorff always satisfy the identity theorem?

1 vote

If $E$ and $F$ are connected subsets of $M$ with $E\cap F\ne\emptyset$, show that $E\cup F$ is connected.

1 vote

Homeomorphism between compact subsets and their diameters

0 votes
Accepted

Which conditions do we need to ensure that the cup product on cochains descends to cohomology?

0 votes

Surface groups are residually finite

0 votes

Fundamental group of $S^2 - \{N,S\}$

0 votes
Accepted

Prove that T = I with Linear Transformations.