- #26

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I would propose that all physicists should learn non-standard analysis, just for the sake of replying to pretentious mathematicians who mock physicists for using infinitesimals.

- You cannot take away a loved infinitesimal from physicists.

Physicists don't do any substitutions anyway. They solve integrals either by looking into a comprehensive math handbook such as Bronstein et al (especially if they are old enough), or put it into Mathematica.

- Half of them would immediately lose the ability to perform a correct substitution.