The story about L'Hopital's rule being work for hire done by Bernoulli because L'Hopital wanted to have something named after him, which now all first year calculus students hear about, is awesome.
Another way to think about is that mathematics is just tautologically true. We begin with axioms, and reason from those axioms to theorems. Those theorems are true, but they are true in a sense that is both more trivial and more significant than things in physical sciences. It is more trivial...