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budwarrior
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6 votes
1 answer
99 views

Hartshorne proposition III.9.7

4 votes
1 answer
89 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
238 views

Tensor product of tensor algebra

3 votes
0 answers
128 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
513 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
87 views

Hartshorne problem III.10.5

1 vote
0 answers
874 views

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

1 vote
1 answer
77 views

Hartshorne exercise III.10.2

1 vote
0 answers
98 views

Hartshorne problem III.4.4

1 vote
1 answer
120 views

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

1 vote
0 answers
40 views

quasi-isomorphisms between bar/cobar constructions are invertible

1 vote
0 answers
359 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
94 views

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

0 votes
0 answers
149 views

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

0 votes
2 answers
682 views

Product rule for determinant over a commutative ring.

0 votes
1 answer
67 views

Euler operator and right bracketing

0 votes
0 answers
68 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
83 views

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

0 votes
0 answers
91 views

Hartshorne problem III.4.10

0 votes
1 answer
73 views

Hartshorne example III.9.8.3