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Paddling Ghost
  • Member for 9 years, 5 months
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5 votes
2 answers
1k views

How to define the operation of division apart from the inverse of multiplication?

5 votes
0 answers
454 views

Ramsey number $R(K_4,K_4,K_4)$.

4 votes
3 answers
1k views

Graph Theory Software with simple GUI

4 votes
3 answers
3k views

Is every vector space an injective module?

3 votes
1 answer
821 views

Cycles in the Fibonacci Sequence mod n with matrices

3 votes
1 answer
2k views

Convergence in measure iff convergence pointwise a.e.

2 votes
2 answers
202 views

Differentials where the variable undergoes a percentage increase. Where am I wrong?

2 votes
1 answer
241 views

Finitely generated module over a quotient of a PID

2 votes
1 answer
200 views

Why is the boundary of an oriented manifold with its (opposite oriented) copy the empty set?

2 votes
1 answer
94 views

A strange scheduling for $K_{24}$.

1 vote
2 answers
1k views

Find the multivariable limit with exponential: $f(x,y) = \frac{e^{xy^2}-1}{x^2+y^2}$ at $(0,0)$

1 vote
1 answer
453 views

Determine all graphs with size $3n-5$ such that $G-e$ is planar for every edge $e$ of $G$.

0 votes
1 answer
506 views

Determine all $k$-critical graphs with $k\ge 3$ such that $G-v$ is $(k-1)$-critical $\forall v \in V(G)$

0 votes
0 answers
108 views

An extemal combinatorial design question. "Weak" steiner stystems.

0 votes
2 answers
105 views

Why is $\infty^0$ an indeterminate form?

0 votes
1 answer
725 views

Definition of a tree and 2 cycles