Vol. 14, No. 3 2007 218â225 â â â Invitation of All People to Statistical Physics Sumio Watanabe Tokyo Institute of Technologyâ 1. ââ â 226-8503 4259 ââ 2. 0 219 2.1 R n Rn Rn = {(x1, x2, ..., xn) ; |xi| < â (âi)} n x = (x1, x2, ..., xn) �x� = � x2 1 + x2 2 + · · · + x2 n n En En = {x â Rn ; �x� < â} n Rn = En . 2.2 n â Râ = {(x1, x2, ..., xn, ...) ; |xi| < â(âi)} x = (x1, x2, ..., xn, ...) �x� =
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