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A comment on Poor Foundations in Geometric Algebra. Parent comment
> janky J-map
There you go
> Infinitesimals
Infinitesimals are completely well-founded. It's just that Archimedes and Newton didn't know a foundation for them.
https://en.m.wikipedia.org/wiki/Surreal_number
"But they didn't have any kind of mathematical foundation until the 1960's, when Robinson found a way to coherently axiomitize them."
> janky J-map
There you go
> Infinitesimals
Infinitesimals are completely well-founded. It's just that Archimedes and Newton didn't know a foundation for them.
https://en.m.wikipedia.org/wiki/Surreal_number