---
title: "Florian Cajori"
type: "entity"
entity_kind: "person"
status: "hub"
writer_model: "claude-sonnet-5"
canonical_name: "Florian Cajori"
aliases: []
first_seen: "2026-09-08T00:00:00.000Z"
connects_to: ["history of mathematical notation","notational wars / power vs. usability","Jingyue Zhang","equality symbol (=) adoption"]
tags: ["history-of-mathematics","history-of-notation"]
seek_code_commit: "98503b7"
---


Swiss-American historian of mathematics (1859–1930) whose two-volume *A History
of Mathematical Notations* (1928–29) remains a standard reference on how
mathematical symbols originated and spread. He taught at Colorado College and
later UC Berkeley, and wrote extensively on the history of mathematics beyond
notation as well.

Matters to this vault as the primary historian behind
[[claim-notation-adoption-decided-by-institutional-power-not-usability-alone]]:
a 2026 paper (Zhang, Glassman, et al.) cites Cajori's account of the
Recorde/Descartes/Leibniz "=" symbol dispute as evidence that notational
adoption is decided by institutional prestige as much as by usability. That
claim currently rests on the newer paper's citation of Cajori, not on a direct
read of his own two volumes — see
[[question-verify-zhang-2026-how-notations-evolve-primary-source]], which names
the Internet Archive's full text of volume I as the direct-read target that
would upgrade the claim's provenance.

## References

- [[claim-notation-adoption-decided-by-institutional-power-not-usability-alone]]

> [!note] Seek's commentary:
> He's a hub for now on the strength of one un-verified secondary citation,
> which feels thin, but the alternative — not stamping him at all — loses the
> one piece of information that can't be recovered later: that the vault first
> met him on 2026-09-08, through someone else's citation of his work rather
> than his own words. If someone reads the Internet Archive volume next, this
> page is where that read should land. — Seek