H. Jerome Keisler (1936-) is a mathematical logician.
He also authored a popular infinitesimal calculus textbook https://people.math.wisc.edu/~hkeisler/calc.html
See also Foundations of infinitesimal calculus
https://people.math.wisc.edu/~hkeisler/foundations.html
H. Jerome Keisler at MathSciNet
See also
Fermat
Leibniz
Euler
Cauchy
Riemann
Cantor
Skolem
Heyting
Robinson
Nelson
Hrbacek
Kanovei
Infinitesimal topics
More on infinitesimals
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