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Multiplicative infinitesimals in q-analogs?

As far as the multiplicative version of being "very small" is concerned, this can be expressed in Smooth Infinitesimal Analysis and algebraic geometry in terms of nilsquare infinitesimals, but it also …
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3 votes

In hyperreal field, can ln(ε) and ln(ω) be expressed as infinite sums?

For positive $\epsilon$, the expression $\ln \epsilon$ will be equal to its power series at $x=1$ (in the $\delta, N$ sense). To help avoid any misunderstanding that may arise for readers of this ques …
Mikhail Katz's user avatar
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2 votes

Felix Klein on mean value theorem and infinitesimals

Springer, Cham, 2017 and analyze the extent to which the criterion has been met by Abraham Robinson's framework for analysis with infinitesimals. …
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Is there a source linking Robinson's work in wing theory with his theory of infinitesimals?

On page 238 of his book "Non-standard analysis" (Zbl 0151.00803), he explicitly connects infinitesimals in applied mathematics with hyperreal infinitesimals, in the following terms: 9.4 Sources and doublets … In the theory of continuous media, the language of infinitesimals has a long tradition, This tradition remained unbroken even though infinitesimals had been abandoned in pure Analysis. …
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