Abraham Robinson

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Abraham Robinson (born Robinsohn;[1] October 6, 1918 – April 11, 1974)
was a mathematician who is most widely known for development of
non-standard analysis, a mathematically rigorous system whereby
infinitesimal and infinite numbers were reincorporated into modern mathematics.

Nearly half of Robinson's papers were in applied mathematics rather than in pure
mathematics.[2]

Nonstandard analysis was originated in the early 1960s
by Abraham Robinson.[4][5] He wrote:

... the idea of infinitely small or infinitesimal quantities seems to
appeal naturally to our intuition.
At any rate, the use of infinitesimals was widespread during the formative stages of
the Differential and Integral Calculus. As for the objection ...
that the distance between two distinct real numbers cannot be infinitely small,
Gottfried Wilhelm Leibniz argued that the theory of infinitesimals implies
the introduction of ideal numbers which might be infinitely small or
infinitely large compared with the real numbers but which were to
possess the same properties as the latter.

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Applied mathematics is the application of mathematical methods by
different fields such as physics, engineering, medicine, biology, business,
computer science, and industry.

Thus, applied mathematics is a combination of mathematical science
and specialized knowledge.
The term "applied mathematics" also describes the professional specialty
in which mathematicians work on practical problems by formulating
and studying mathematical models.