57Jimmy
  • Member for 5 years, 6 months
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3 answers
11 votes
444 views
1 bookmarks
How does passing to ideals solve the problem of unique factorization?
1 answers
11 votes
2k views
4 bookmarks
Quasi-inverse of an equivalence of categories is unique up to unique isomorphism
1 answers
10 votes
705 views
3 bookmarks
Confusion about genus-degree formula
1 answers
8 votes
1k views
3 bookmarks
The orthogonal group $O(q)$ associated with a quadratic form $A$
2 answers
7 votes
720 views
2 bookmarks
Injectivity, surjectivity and pullback diagrams
1 answers
7 votes
139 views
1 bookmarks
Matrix with permutations of $\{1,\dots,n\}$ is invertible
1 answers
6 votes
63 views
1 bookmarks
Tensor product and dual of $k$-vector spaces over a $k$-algebra: what is the dimension?
1 answers
6 votes
1k views
6 bookmarks
Different definitions of closed differential form
0 answers
5 votes
55 views
1 bookmarks
Which line bundle on $A$ is the pull-back of the Poincaré bundle via a given morphism $A \to A^*$?
1 answers
5 votes
89 views
1 bookmarks
Modules over the dual of an infinite dimensional coalgebra
0 answers
5 votes
107 views
2 bookmarks
Homology of Fermat curve
1 answers
5 votes
92 views
1 bookmarks
Geodesic quadrangles in CAT($0$) spaces
2 answers
4 votes
315 views
3 bookmarks
Zero element of Ext$^n$ groups
0 answers
4 votes
47 views
Is a tensor product of subquotients a subquotient of the tensor product?
1 answers
4 votes
1k views
Factor theorem for multiple variables
2 answers
4 votes
204 views
2 bookmarks
Tensor product that is not $0$
0 answers
3 votes
47 views
1 bookmarks
Database for properties of categories
1 answers
3 votes
41 views
1 bookmarks
Structure sheaf of a locally ringed space can be pulled back from an open cover
2 answers
3 votes
67 views
Power of simple object cannot be a proper subobject of itself
2 answers
3 votes
70 views
Units in $R[x,x^{-1}]$
1 answers
3 votes
87 views
Invertible elements in $A \otimes B$
2 answers
3 votes
184 views
Representations of $\mathbb{G}_m$
2 answers
3 votes
203 views
1 bookmarks
Jump of dilogarithm
1 answers
3 votes
82 views
1 bookmarks
Pullback of a single map
1 answers
3 votes
156 views
1 bookmarks
On the functional equation of the theta function
1 answers
3 votes
121 views
Correct definition of singular homology
1 answers
3 votes
804 views
Representations and representable functors
0 answers
3 votes
89 views
1 bookmarks
Projection from algebraic variety is surjective
0 answers
3 votes
27 views
1 bookmarks
Why can't closed subschemes be defined in an easier way?
1 answers
3 votes
61 views
1 bookmarks
Special $k$-algebra is finitely generated