Bars, Sezgin and Nishino have proposed super Yang-Mills theory in D = 12 and beyond. Here we consider M-theory in signature (10,1) as a reduction of signature (10,2), using a projection of π’8(β24) along b2. The projection gives a visual decomposition of π’8(β24) that makes the vector of π°π¬(10, 2) and its spinor manifest. Reduction along a time direction yields an π°π¬(10, 1) invariant subspace that we associate with the spacetime of D = 11 M-theory.
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