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397 398 HANS ARWED KELLER complete fields; the valuations in question have infinite rank. Investigations on the particular properties of these spaces E lead, via the fundamental theorem of projective geometry, to maps /: E -> E which are semilinear, i.e. linear up to some fixed automorphism T of the base field K. It is then crucial to know that τ and T" 1 are continuous. We refer to  for a comprehensive account on orthomodular spaces.doi:10.2140/pjm.1986.121.397 fatcat:y2g434rnh5h7taucv2nnfvvqsa