Definition of a vector being orthogonal to a subspace

Created almost 9 years ago, updated about 8 hours ago

A vector $x$ is orthogonal to a subspace $W$ if $\langle w,x\rangle=0$ for every $w\in W$. Conjugate symmetry makes the slot order irrelevant for a zero condition. It is enough to check a spanning set, because inner products respect linear combinations.

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