User Bruce Blackadar - MathOverflow

Bruce Blackadar

Member for 12 years
Last seen more than a month ago

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15 Questions

Score Activity Newest Views

20 votes

2 answers

1k views

Closed subspaces of Banach spaces

asked Apr 6 at 18:17

16 votes

1 answer

483 views

Balls in Hilbert space

asked Aug 18, 2020 at 4:35

15 votes

1 answer

4k views

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

asked Dec 12, 2014 at 18:11

14 votes

1 answer

1k views

Stone-Weierstrass Theorem without AC

asked Apr 23 at 15:10

12 votes

1 answer

510 views

Approximations to $\pi$

asked Jan 29, 2020 at 6:06

11 votes

1 answer

675 views

Axiom of choice in linear algebra

asked Nov 25, 2021 at 17:17

10 votes

1 answer

614 views

Decomposability of Hausdorff measure

asked Jan 24, 2012 at 23:25

9 votes

2 answers

1k views

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

asked Dec 4, 2013 at 22:47

9 votes

3 answers

701 views

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

asked Apr 22, 2017 at 22:59

8 votes

1 answer

3k views

Non-analytic function with convergent Taylor series everywhere

asked Nov 22, 2011 at 14:49

7 votes

0 answers

577 views

Does local strict contractibility imply ANR?

asked Jul 19, 2012 at 22:04

4 votes

2 answers

441 views

Number of torsion-free abelian groups

asked Mar 12, 2017 at 15:02

3 votes

1 answer

419 views

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

asked Apr 28, 2017 at 3:16

2 votes

1 answer

79 views

Monotonicity of Trapezoid Approximations

asked Sep 10, 2014 at 15:16

2 votes

0 answers

76 views

Is every compact convex set covered by a Choquet simplex?

asked May 27 at 21:30