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Zoudelong's user avatar
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Zoudelong
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postgraduate

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question
4
Suppose $A$ is positive definite with $a_{ij}\leqslant 0 (\forall i\neq j)$. Is the matrix $-A+2\mathrm{diag}(a_{11},\dots,a_{nn})$ positive definite?
Oct 24, 2023
question
3
How to compute the cohomology ring of complex projective space with coefficient $\mathbb{Z}$?
Dec 27, 2023
question
3
The degree of the field extension $\mathbb{C}(x)$ over $\mathbb{C}(x^3+x^{-3})$.
Aug 20
question
2
The path components of $Map(X,Y)$ is one to one corresponding to $[X,Y]$, the set of homotopy classes between $X$ and $Y$.
Sep 17, 2023
question
2
A CW-decomposition of $S^n$
Dec 2, 2023
question
2
Comprehension of the definition of 2nd partial derivatives on Riemannian manifolds.
Dec 4, 2023
question
2
What is the pullback in the category of differential manifolds?
Apr 19
question
2
An equivalent condition of parallel mean curvature vector in normal bundle (in an orthonormal frame)
Jun 3
question
2
Varshamov bound is stronger than Gilbert bound
Jul 20
question
1
Direct product implies the splitness of SES.
Dec 9, 2023