In the first part of this paper,we give the definition and properites of Clifford algebra in the Hilbert space H,and the definition of Clifford matrice,which generates sense-preserving Mo|¨bius transformations in H;In the second part of this paper,we discuss the sufficient and necessary condition which guarantees the existence of a Mo|¨bius transformation g actiong on H.The uniqueness of g is also discussed.
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