$L^p$ norms satisfy the triangle inequality.Suggest a slogan
Let \((X,\mcm,\mu)\) be a measure space, let \(1\leq p<\infty\), and let \(f,g\in L^p(\mu)\). Then \(f+g\in L^p(\mu)\) and \[ \norm{f+g}_p \leq \norm{f}_p+ \norm{g}_p . \]
State Minkowski's inequality.
What is Minkowski's inequality?