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As an actuarie this meme is kinda true but mostly false. I had classes on some advanced maths like ordinary differential equations that have never use on my day to day job. But, the actuarial sciences math in collage was elementary school level of abstraction compared with the real world. There's still a lot of excel tho, but I'm cool and use python (pandas) wherever I can.
It's the most general form of Stokes' theorem that the integral of a differential form over the boundary of an volume and the integral of an exterior derivative of this form over that volume are the same. It covers a lot of classic formulas from the fundamental theorem of calculus to Green's theorem, Gauss' theorem and classic Stokes' theorem.