By Banica C., Stanasila O.

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A + : : :)E n i = m1 ! h(A)mE ni: This type of expression is considered in Chapter 3 of 24] in the context of the eigenvalue problem for antisymmetric functions. This provides a good illustration of how the systematic use of a uni ed language leads to analogies between previously separate results. 28) equals det(a)1=2 we need the result that, in spaces with Euclidean or Lorentzian signature, any bivector can be written, not necessarily uniquely, as a sum of orthogonal commuting blades. This is proved in 24, Chapter 3].

The subgroup of spin(p q) containing just the rotors is called the rotor group (this is sometimes written as spin+ (p q) in the literature). 6). Spin groups and rotor groups are both Lie groups and, in a space with mixed signature, the spin group di ers from the rotor group only by a direct product with an additional subgroup of discrete transformations. The generators of a spin group are found by adapting the techniques found in any of the standard texts of Lie group theory (see 57], for example).

Berezin di erentiation is handled within the algebra generated by the feig frame by introducing the reciprocal frame feig, and replacing @ ( $ ei ( (2:12) @i so that @ j $ ei e = i : (2:13) j j @i It should be remembered that upper and lower indices are used to distinguish a frame from its reciprocal frame, whereas Grassmann algebra only uses these indices to distinguish metric signature. 31 The graded Leibnitz rule follows simply from the axioms of geometric algebra. 14) again. Right di erentiation translates in a similar manner, ; @ )@ $ ) ei (2:15) i and the standard results for Berezin second derivatives 35] can also be veri ed simply.