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J.-E. Pin
  • Member for 8 years, 10 months
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  • Paris
8 votes
2 answers
267 views

Rank of a matrix of binomial coefficients

7 votes
1 answer
502 views

Coproduct of bounded distributive lattices given as lattices of subsets

6 votes
1 answer
220 views

Concrete category of topological spaces over preordered sets: what are the initial morphisms?

6 votes
2 answers
253 views

Are the rules of this tournament fair?

6 votes
1 answer
107 views

Analog of an open map for uniform structures

6 votes
2 answers
211 views

Does this ring constructed from a group have an accepted name?

6 votes
1 answer
92 views

If $a_{nk} \leqslant n a_k$ for all $k \geqslant 0$ and $n > 0$, does $a_n/n$ converge?

4 votes
1 answer
97 views

Subgroups of $G^n$, where $G$ is a $p$-group

4 votes
0 answers
120 views

If $f$ and $g$ are analytic functions, does $f \circ g - g \circ f = g- f$ implies $f = g$?

4 votes
1 answer
132 views

Find a first order sentence satisfied in every finite semigroup but not in every compact semigroup

4 votes
2 answers
88 views

If $H$ is a subgroup of a group $G$, is there a standard name for subsets of the form $xHy$?

3 votes
2 answers
66 views

Convergent subsequence of $x^n$ to the identity element in a compact group

3 votes
0 answers
70 views

The power of Archimedean spirals: is there an algebraic characterization of Archimedean numbers?

3 votes
1 answer
214 views

Example of a compact, Kolmogorov space with a basis of compact open sets, but not spectral.

2 votes
0 answers
99 views

In the category of uniform spaces, is the completion of a quotient map also a quotient map?

2 votes
1 answer
59 views

Partial cyclic order and betweenness

1 vote
0 answers
62 views

Is there a standard terminology for the preorder induced by a monotone map?

1 vote
1 answer
64 views

Probability to seat at the same table in a poker tournament.

1 vote
1 answer
109 views

Boolean algebra generated by value sets of polynomials over $\mathbb{N}$

1 vote
1 answer
65 views

Is every zero-dimensional metrisable space ultrametrisable?

0 votes
0 answers
45 views

Looking for the IBM report: Beckman, Categorical notions and duality in automata theory

0 votes
1 answer
43 views

Terminology for the restriction of the product of two morphisms to its image

0 votes
0 answers
39 views

A curious logical formula involving prime numbers [duplicate]

-1 votes
1 answer
54 views

How to interpret inequalities between morphisms in a categorical setting