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budwarrior
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6 votes
1 answer
104 views

Hartshorne proposition III.9.7

4 votes
1 answer
93 views

Hartshorne theorem II.8.19

3 votes
0 answers
97 views

Hartshorne problem II.8.7

3 votes
1 answer
166 views

How is the differential induced by $d_C$ on $\Omega C$ defined for $(C,d_C)$ is a dga coalgebra?

3 votes
1 answer
240 views

Tensor product of tensor algebra

3 votes
0 answers
130 views

The relation between the Kozsul dual coalgebra and the Koszul dual algebra of a quadratic algebra.

3 votes
1 answer
80 views

Generalized koszul complex

2 votes
1 answer
515 views

show that the path space fibration is a fibration

2 votes
1 answer
67 views

How does coassociativity of a coalgebra $C$ imply that the derivation on $\Omega C$ is a differential?

2 votes
1 answer
140 views

Under what assumptions on the grading is the fundamental theorem of twisting morphisms true?

2 votes
1 answer
89 views

Hartshorne problem III.10.5

1 vote
0 answers
900 views

3- connectivity of G-e and G/e where e is an edge of a 3-connected graph G.

1 vote
1 answer
84 views

Hartshorne example III.9.8.3

1 vote
1 answer
81 views

Hartshorne exercise III.10.2

1 vote
0 answers
105 views

Hartshorne problem III.4.4

1 vote
1 answer
121 views

Does the differential of an augmented dga algebra fix the augmentation ideal?

1 vote
0 answers
41 views

quasi-isomorphisms between bar/cobar constructions are invertible

1 vote
0 answers
365 views

What is the internal grading of Ext

1 vote
0 answers
86 views

Express the dual space of the tensor algebra as a direct sum

1 vote
1 answer
96 views

Is there a multiplication on the tensor product of an algebra and a coalgebra?

0 votes
0 answers
150 views

How is the bar construction on augmented graded algebras a functor?

0 votes
2 answers
700 views

Product rule for determinant over a commutative ring.

0 votes
1 answer
67 views

Euler operator and right bracketing

0 votes
0 answers
70 views

Free resolution of k as an A-module

0 votes
0 answers
54 views

What is the minimal number of generators for $\mathcal{O}_{\mathbb{P}^n}(1)$?

0 votes
1 answer
86 views

Is a sheaf, which is flasque when restricted to any open affine necessarily flasque?

0 votes
0 answers
92 views

Hartshorne problem III.4.10