mathlib3

d645d0e8 - feat(analysis/calculus/uniform_limits_deriv): Swap limits and derivatives (#14090)

feat(analysis/calculus/uniform_limits_deriv): Swap limits and derivatives (#14090) This commit proves that the derivative of the pointwise limit of a series of functions is the limit of the derivatives when the derivatives converge uniformly in some closed ball. This and #13500 are two fundamental theorems for bootstrapping the theory of Dirichlet series. This theory underlies my ongoing attempts to prove the density of squarefree integers.