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justin
  • Member for 8 years, 8 months
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1 vote

Is the whole set $\mathbb R$ open?

0 votes

How are primitive mathematical objects chosen?

5 votes

Do the axioms of set theory actually define the notion of a set?

5 votes

Critical points of a function

0 votes

Proof that an archimedean absolute value on $\mathbb Q$ is equivalent to $|\ |_\infty$

1 vote
Accepted

Definition of a Finite Normal Extension

0 votes
Accepted

Prove there is no neighborhood of $0$ on which $f$ is monotonically increasing.

1 vote
Accepted

How should I calculate the cosets of a subgroup of $\mathbb Z\times \mathbb Z?$

2 votes
Accepted

How to compute associative binary operation on a finite set based on partial information?

0 votes

Proving that $3|x^2 \implies 3|x$.

0 votes
Accepted

Trying to find base case in recursive argument that a sequence with only finitely many peak indices has a monotone subsequence.

2 votes
Accepted

Proving a injectivity in a separable Hausdorff space.

0 votes
Accepted

Hypersphere isometry?

4 votes
Accepted

There exists no inner product on $\mathbb R^n$ that induces the maximum norm