Polarization identity

In mathematics, the polarization identity is any one of a family of formulas that express the inner product of two vectors in terms of the norm of a normed vector space. Let $\|x\| \,$ denote the norm of vector x and $\langle x, \ y \rangle \,$ the inner product of vectors x and y. Then the underlying theorem, attributed to Fréchet, von Neumann and Jordan, is stated as:

单词	Polarization identity
释义	Polarization identity 英语百科 Polarization identity In mathematics, the polarization identity is any one of a family of formulas that express the inner product of two vectors in terms of the norm of a normed vector space. Let $\\|x\\| \,$ denote the norm of vector x and $\langle x, \ y \rangle \,$ the inner product of vectors x and y. Then the underlying theorem, attributed to Fréchet, von Neumann and Jordan, is stated as:
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