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The contents of this monograph fall within the general area of nonlinear functional analysis and applications. 2 2 2 2 ||?. ||x|| +(1??). ||x?y||, (??). which hold for all x,y?. However, as has been rightly observed by M. Hazewinkel, ". many, and probably most, mathematical objects and models do not naturally live in Hilbert spaces".
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