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6h
awarded  Populist
2d
revised Whats the difference between modular forms of different levels?
deleted 5 characters in body
2d
answered Whats the difference between modular forms of different levels?
2d
comment Space of functions in the upper half-plane
I don't think there is a standard name for this vector space.
2d
comment Taylor expansion in $p$-adic integers
CYC, is this supposed to be an equality of polynomials in $y$? It cannot be... Or are you saying that for every $x,y$ in $\mathbb Z_p$, there is an $a \in \mathbb Z_p$ such that the equality holds? Or is $a$ a polynomial? You're missing some quantifiers
2d
comment Taylor expansion in $p$-adic integers
@Pavel The OP is working in $\mathbb Z_p$ and not in $\mathbb Q_p$. $p$ is not invertible in $\mathbb Z_p$.
2d
answered Is annihilator of maximal submodule is a maximal ideal?
2d
asked When is the symmetric algebra of a vector bundle finitely-generated?
2d
answered What is the derivative of floor function?
2d
comment Non-split chain complex which is chain-homotopy equivalent to its homology sequence
What do you mean by a "split chain complex"?
2d
answered What's the difference between cohomology theories of varieties and topological spaces
Jan
18
comment When is the pushforward of a quasi-coherent sheaf quasi-coherent? Hartshorne proof
In fact the exact sequence would have to use an infinite product!
Jan
16
comment De Rham Cohomology of the complement of an ellipse
@Mike I think you mean that his $U_2$ is diffeomorphic to the punctured plane!
Jan
15
comment What would change in mathematics if we knew $\pi+e$ is rational?
@Markus My pleasure!
Jan
15
answered What would change in mathematics if we knew $\pi+e$ is rational?
Jan
7
comment In a ring of characteristic 2 every prime ideal is maximal ideal
This is very false. Where did you get this problem?
Jan
5
accepted Are there relations among Frobenii?
Jan
5
comment De Moivre's theorem application
I think you mean De Moivre!
Jan
5
comment Spectrum of $\mathcal{O}(U)$
It's not true in general that $\text{Spec} \mathcal O(U) = U$ for an open subset $U$ of an affine scheme. A counter-example is the affine plane minus the origin.
Jan
2
accepted How many non-rational complex numbers $x$ have the property that $x^n$ and $(x+1)^n$ are rational?