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The infinite class of massless spin-1 actions formed from the two algebraic invariants Fmu nu Fmu nu , Fmu nu *Fmu nu which allow a supersymmetric extension is derived. It is shown that (to second nonlinear order at least) these extensions all have causal propagation, even though only one of them (Born-Infeld) was causal before supersymmetrisation.
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Deser et al. (1980) studied this question.
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