![Screenshot of www2.math.upenn.edu: A short proof of the Hairy Ball theorem (2016) [pdf]](https://hn.urlbox.com/shots/renders/2025/8/25/3875485d-7c3e-4ab9-a980-3d1e77f66bee.jpg)
First screen, captured .
Looks similar
Harmonic Function Theory(axler.net)
34 points by ibobev | 12 comments
![Screenshot of jdb19937.github.io: The reciprocal sum of the prime-prefix-free numbers converges [pdf]](https://hn.urlbox.com/shots/renders/2026/10/9/782dd723-5a0f-4ad2-9aa4-d11ae9b968a4.jpg)
The reciprocal sum of the prime-prefix-free numbers converges [pdf](jdb19937.github.io)
15 points by jdb1729 | 14 comments
A math paper proving, assuming the Riemann Hypothesis, that the reciprocal sum of prime-prefix-free integers (OEIS A287117) converges, with bounds verified in Lean 4.
![Screenshot of cccg.ca: Computational Balloon Twisting: The Theory of Balloon Polyhedra [pdf]](https://hn.urlbox.com/shots/renders/2026/7/7/2858b07f-1142-47cd-ae8b-528c1fc368af.jpg)
![Screenshot of cr.yp.to: The cryptoint library (2025) [pdf]](https://hn.urlbox.com/shots/renders/2026/10/17/d7252175-f03a-4bd6-9d9e-1f6d618c09c4.jpg)
The cryptoint library (2025) [pdf](cr.yp.to)
21 points by akkartik | 0 comments
Daniel J. Bernstein's paper describing cryptoint, a C/C++ library of constant-time integer functions designed to resist compiler optimizations that introduce timing leaks.
