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Starting from the infinitesimal holonomy groupH i of aV 4, (+++?) the spinholonomy group\(\tilde H_i \equiv \bar \sigma ^1 (H_i )\) defined by the covering isomorphism\(\sigma :G \to L_ + ^ \uparrow \) is introduced. In Einstein-spaces we may replace its real Lie-algebra by a complex one. With the complex calculus we may reproduce the results ofSchell, Goldberg andKerr with very much simplified proofs. A theorem on non-empty Einstein-spaces is given. In part 4 we prove a theorem on the connection between theH i -behaviour of a vector (spinor) and its covariant derivative in aV 4. With its help we get in a simple manner the metiics of aV 4 with givenH i and Dim (H i ) <6; our results agree with those given byGoldberg andKerr, Cahen andDebever. Finally we make some new statements on imperfect holonomy groups.  相似文献   

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Zeitschrift für Physik A Hadrons and nuclei -  相似文献   

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Zeitschrift für Physik A Hadrons and nuclei -  相似文献   

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