Considering a Euclidean space of n dimensions, we have vectors q with coordinates qr (r = 1, 2,…, n). For the present we shall restrict the q’s to be real, so that the qr are real numbers. The vector q has the squared length qrqr, a summation being understood over r. We also write it as the scalar product (q, q).
KeywordsHILBERT Space Finite Number Real Vector Complex Vector Null Vector
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