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earned this badge 15 times.
Is $O_n({\bf Q})$ dense in $O_n({\bf R})$?
Awarded Jan 17 at 6:16
Continuous version of the fundamental theorem of invariant theory for the orthogonal group
Awarded Aug 19 '20 at 17:47
Convergence of Newton's method
Awarded Oct 26 '18 at 14:00
Characterizing $\mathbf{R}$ as an ordered group
Awarded Jun 10 '18 at 20:13
Examples of interesting non orientable closed 3-manifolds
Awarded Sep 20 '17 at 21:55
How many subspaces are generated by three or more subspaces in a Hilbert space?
Awarded Jul 23 '17 at 9:48
Injectivity implies surjectivity
Awarded Jul 4 '17 at 12:12
Closed manifolds with the fixed point property
Awarded Mar 28 '17 at 16:39
The $2\pi$ in the definition of the Fourier transform
Awarded Mar 23 '17 at 15:58
Examples of $G_\delta$ sets
Awarded Sep 2 '16 at 11:46
The “right” topological spaces
Awarded Sep 2 '16 at 0:49
Does the Brouwer fixed point theorem admit a constructive proof?
Awarded Apr 14 '15 at 16:42
sets with positive Lebesgue measure boundary
Awarded Aug 9 '12 at 7:20
What is the oldest open problem in mathematics?
Awarded Feb 4 '11 at 23:50
Rational numbers with dense orbits in [0,1] under iteration by f(x)=4x(1-x)
Awarded Jun 4 '10 at 22:35

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