added this quote, for fun:

I believe that we lack another analysis properly geometric or linear which expresses location directly as algebra expresses magnitude.

which Bredon 93, p. 430 says is due to Leibniz in a letter to Huygens 1679

Not sure what a real source reference would be. Googling for the full quote gives another topoloy textbook that also quotes it this way, but also without further reference details

]]>there was a broken pointer to “basic problems of algebraic topology” which I am removing hereby.

(It may be interesting to have such a page, and then we can still add a link, but it is pointless to have a broken link to a non-existent such page.)

]]>added pointer to:

- Tai-Danae Bradley, Tyler Bryson, John Terilla,
*Topology – A categorical approach*, MIT Press 2020 (ISBN:9780262539357, web version)

fix the interval (-1,1) wrongly written as (0,1) in the example of homeomorphism

Monothink

]]>added pointer to

- Michael Müger,
*Topology for the working mathematician*, Nijmegen 2018 (pdf)