Effective infinitesimals in ℝ (MOPA) (video).
Alternatively,
https://youtu.be/YE68yptMMeQ
See 23c
See also
Infinitesimal analysis without the axiom of
choice
Fermat
Leibniz
Euler
Cauchy
Skolem
Robinson
Nelson
Hrbacek
More on infinitesimals
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