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btilly

I'm tilly on Perlmonks, btilly on Hacker News, and am active in many forums. I know Perl and math pretty well, but dabble in lots of things.

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4 If $b \cdot a = c\cdot a$ for equal-sized non-zero vectors $a, b, c$, does it follow that $c = b$? Mar 1 '17
4 Is A a proper set of its power set? Mar 21 '17
3 $F \subset \mathbb{R}$ is closed. Prove there exists a countable $E \subset F$, where $\bar{E} = F$. Sep 25 '18
3 Number of distinct arrangements {$n_i$} $n_1<n_2<n_3<n_4<n_5$ such that $\sum n_i=20$ Mar 9 '17
3 The space of pairs of intersecting line segments in $\mathbb{R}^2$ is open or closed? Aug 9 '19
3 How much of calculus can we formalize without infinity? Feb 15 '17
2 Limit of indeteminate form $1^{(∞)}$ May 24 '16
2 Disproving sequential compactness Feb 15 '17
2 Number of Solutions for $p^2 - q^2$ = n? Mar 2 '17
2 Prove that the $n-sphere$ is a manifold Mar 2 '17
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