Bruce Blackadar's user avatar
Bruce Blackadar's user avatar
Bruce Blackadar's user avatar
Bruce Blackadar
  • Member for 11 years, 10 months
  • Last seen more than a month ago
20 votes
2 answers
943 views

Closed subspaces of Banach spaces

16 votes
1 answer
465 views

Balls in Hilbert space

15 votes
1 answer
3k views

Is there a simple direct proof of the Open Mapping Theorem from the Uniform Boundedness Theorem?

14 votes
1 answer
1k views

Stone-Weierstrass Theorem without AC

12 votes
1 answer
508 views

Approximations to $\pi$

11 votes
1 answer
587 views

Axiom of choice in linear algebra

10 votes
1 answer
608 views

Decomposability of Hausdorff measure

9 votes
2 answers
1k views

Is there a differentiable but nonsmooth version of the continuous Implicit Function Theorem?

9 votes
3 answers
701 views

When are $\mathbb{R}^n$ and $\mathbb{R}^m$ essentially similar?

8 votes
1 answer
3k views

Non-analytic function with convergent Taylor series everywhere

7 votes
0 answers
569 views

Does local strict contractibility imply ANR?

4 votes
2 answers
439 views

Number of torsion-free abelian groups

3 votes
1 answer
411 views

Is there an algebraic formula for the eigenvalues of a symmetric $n\times n$ matrix?

2 votes
1 answer
78 views

Monotonicity of Trapezoid Approximations

2 votes
0 answers
70 views

Is every compact convex set covered by a Choquet simplex?