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Pierre-Yves Gaillard's user avatar
Pierre-Yves Gaillard's user avatar
Pierre-Yves Gaillard's user avatar
Pierre-Yves Gaillard
  • Member for 13 years, 10 months
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26 votes
3 answers
4k views

What is the origin of the expression “Yoneda Lemma”?

26 votes
1 answer
5k views

About a paper of Zermelo

24 votes
3 answers
2k views

Did Zariski really define the Zariski topology on the prime spectrum of a ring?

20 votes
2 answers
713 views

vector spaces whose algebra of endomorphisms is generated by its idempotents

15 votes
2 answers
4k views

Infinite product of fields

15 votes
2 answers
1k views

Is every endomorphism of a vector space a linear combination of idempotents?

11 votes
1 answer
262 views

Are there functors $F,G:\textbf{Set}^{\operatorname{op}}\to\textbf{Set}$ such that $\operatorname{Hom}(F,G)$ is NOT a set?

11 votes
1 answer
307 views

Is every commutative ring a limit of noetherian rings?

11 votes
1 answer
393 views

Is an epimorphic endomorphism of a noetherian commutative ring necessarily an isomorphism?

10 votes
3 answers
437 views

Is $K[X]\hookrightarrow K[[X]]$ an epimorphism?

9 votes
2 answers
508 views

Equalizers in CRing

9 votes
1 answer
875 views

Exercise 4.6 (iii) in the HoTT Book

9 votes
2 answers
756 views

Iterated duals of a vector space

8 votes
3 answers
425 views

Tensor-commutative abelian groups

8 votes
1 answer
945 views

The spectrum of a product of rings

8 votes
1 answer
173 views

Generators of a certain ideal

8 votes
1 answer
2k views

Preservation of direct sums and finite generation

7 votes
1 answer
2k views

Holomorphic function of a matrix

7 votes
2 answers
296 views

Computing a cardinal and an ordinal

7 votes
0 answers
528 views

Isomorphisms of free modules and extension of scalars

7 votes
0 answers
172 views

Is the product of Jacobson rings a Jacobson ring?

7 votes
1 answer
411 views

Unique prime ideal factorization in noetherian domains?

7 votes
1 answer
209 views

Are unique prime ideal factorization domains noetherian?

7 votes
1 answer
136 views

Does the lattice of ideals of a ring know which ideals are prime?

7 votes
1 answer
675 views

Finite dimensional local rings with infinitely many minimal prime ideals

6 votes
1 answer
189 views

Does the Cantor-Schröder-Bernstein Theorem hold in the category opposite to the category of noetherian commutative rings?

6 votes
3 answers
154 views

How to classify $\mathbb N^2$-orbits?

6 votes
2 answers
283 views

Is there a non-artinian noetherian ring whose non-units are zero-divisors?

6 votes
1 answer
176 views

Does the category of artinian rings admit finite limits?

6 votes
1 answer
205 views

Prescribing the dimension of intersections of sub-vector spaces