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In the paper (Theoret. Comput. Sci. 237 (2000)) Anderson present a theorem which characterizes any semiretract S by means of two retracts R and R!: The /rst part of the paper contains a counterexample for this characterization. Then some results are presented which /nally lead to the theorem which determines for a given semiretract S the minimal number of retracts R1; : : : ; Rm such that the e...
We discuss a gauged U(1)R supergravity on five-dimensional orbifold (S/Z2) in which a Z2-even U(1) gauge field takes part in the U(1)R gauging, and show the structure of Fayet-Iliopoulos (FI) terms allowed in such model. Some physical consequences of the FI terms are examined.
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