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Marginis.AhlmanKoponen2015

def automorphism_of_fin_2 (f : Fin 2Fin 2) :
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    theorem fin2 (x : Fin 2) :
    x = 0 x = 1
    theorem fin2_rigid (f : Fin 2Fin 2) (hf : automorphism_of_fin_2 f) :
    f = id

    Fin 2 is rigid as an additive structure.

    def automorphism_of_fin_k (k : ) (f : Fin kFin k) :
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      def is_rigid (k : ) :
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