Skip to main content
John Smith 's user avatar
John Smith 's user avatar
John Smith 's user avatar
John Smith
  • Member for 11 years, 7 months
  • Last seen more than 2 years ago
12 votes
2 answers
4k views

Countable unions of countable sets

12 votes
5 answers
2k views

Motivation for natural deduction

11 votes
2 answers
210 views

Vertex Reconstruction Conjecture For Asymmetric Graphs

11 votes
2 answers
934 views

Axiom of binary choice vs Axiom of finite choice

9 votes
1 answer
1k views

Counterexamples to the continuum hypothesis

6 votes
2 answers
2k views

Dilworth's Theorem Implies Konig's Theorem

6 votes
2 answers
488 views

Graphs where changing any edge increases the clique or independence number

5 votes
1 answer
1k views

Size Of Proper Classes

5 votes
1 answer
224 views

Complexity Of Recognising Complete Multipartite Graphs

5 votes
2 answers
383 views

Why are "the" morphisms of the category of topological spaces continuous maps?

5 votes
2 answers
2k views

Proof Of König's Lemma

4 votes
0 answers
146 views

Countable Choice And Countable Union Of Countable Sets Being Countable

4 votes
3 answers
1k views

What Is An Endomorphism Monoid?

4 votes
1 answer
2k views

Definition of Tensor Product of Graphs

4 votes
0 answers
76 views

Is this a thing: Generalisation of the Petersen graph

4 votes
1 answer
1k views

Biggest Unsolved Problems In Graph Theory ( a la Riemann Hypothesis to Number Theory)

3 votes
1 answer
229 views

Unprovable arithmetic statements in RCA0, WKL0

3 votes
1 answer
215 views

Definition Of Strongly Regular Graphs

3 votes
1 answer
2k views

Intersecting set systems and Erdos-Ko-Rado Theorem

3 votes
0 answers
522 views

Score Sequences Of Tournaments And Isomorphism

3 votes
1 answer
193 views

Infinite graph theory: What's a tree?

3 votes
1 answer
2k views

Infinite Trees, Infinite Branches, And Choice

3 votes
1 answer
571 views

Golden Ratio Sequence

2 votes
1 answer
443 views

Dedekind Construction Of Real Numbers

2 votes
0 answers
44 views

Any connection at all between the Gamma Function and the theory/enumeration of ordered sets and lattices?

2 votes
1 answer
2k views

Countable infinity and the axiom of choice

2 votes
3 answers
1k views

Ways Of Ordering A Set

2 votes
1 answer
253 views

(Adjacency) Matrix Multiplication VS Graph Homomorphism

1 vote
1 answer
391 views

Kelly's Proof Of Reconstruction Conjecture For Trees

1 vote
0 answers
90 views

Infinite Perfect Graphs