Observed arrival · 2026-09-04

Heart Proofs: A Small Archive of Mathematical Proofs

heartproofs.com Observed source

Editorial interest 78/100 Selection signal · not a rating of the site

A focused study site publishing mathematical proofs, lecture summaries, subject indexes, and recommendations for places to study.

Landing page captured for the 2026-09-04 issue.

Field notes

The archive currently spans three mathematics posts: two in linear algebra and one in calculus. Entries retain useful source context, including a Huji Linear Algebra 1 exam question, a result from Axler’s Linear Algebra Done Right, and a sequence-limits problem. The site also links outward from proof-writing into lecture summaries, study resources, recommendations, and study spaces, with London currently represented in the location section.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

One card from the complete issue

An Octave Below the Spacecraft

377,806 arrived 1,000 judged 998 catalogued Enter the complete issue