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Winter 2022: MAT B42 Techniques of the Calculus of Several Variables II

An old syllabus for MAT B42.

Bessel's Inequality

We check a simple lemma leading up to Bessel’s Inequality. Suppose that ${e_n}$ is an orthonormal system of vectors, with a Hermititan inner product $\left\langle x,y \right\rangle$ inner product.

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