ProofWiki:Jokes/Sex is Fun

Let $e^{x / n} = \dfrac \d {\d x} \map f u$.
 $\ds \sqrt [n] {e^x} =$ $=$ $\ds \dfrac \d {\d x} \map f u$ $\ds \leadsto \ \$ $\ds \paren {\sqrt [n] {e^x} }^n$ $=$ $\ds \paren {\dfrac \d {\d x} \map f u}^n$ $\ds \leadsto \ \$ $\ds e^x$ $=$ $\ds \paren {\dfrac \d {\d x} \map f u}^n$ $\ds \leadsto \ \$ $\ds \int e^x$ $=$ $\ds \int \paren {\dfrac \d {\d x} \map f u}^n$ $\ds \leadsto \ \$ $\ds \int e^x$ $=$ $\ds \map f u^n$
Purists are entitled of course to quibble that the left hand side should really read $\ds \int e^x \rd x$.