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{1, -1} x C be the mapping so defined: B(a) where a* = { a -a when when = (( -1)", a*) = a 1 (mod 4), a= -1 (mod 4), (we remark that if a E P(2e) then a is odd) and r = { 0 1 when when = a 1 (mod 4), a= -1 (mod 4). It is obvious that B is a group-homomorphism and from a = ( -1 )"a* we conclude that B is one-to-one. Since P(2e) and {1, -1} x C have 2'- 1 elements, it follows that B is an isomorphism.

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