From: Yannis Chatzigiannelis (cv94044(@)central.ntua.gr)
Date: Παρ 16 Ιουλ 1999 - 14:23:33 EEST

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isxyei

(n+k)^2 = n^2 + 2nk +k^2 = 1 + n^2 + 2nk +k^2 -1=

• 1 + n^2 + (k+1+k-1)n + (k+1)(k-1) = 1 + (n+k+1)(n+k-1)

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