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Card 369 of 9982026-09-04 issue

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.

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Editorial observations of this landing page, not a rating.

OpenPublic substance visible
PrettyNotable craft visible
ProPolished or operationally mature
NicheUnusually specific use

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heartproofs.com

Landing page observed 2026-09-04. The live site may have changed.