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Proposition: For proving the goal G[x <- F(a0, ..., an-1)] with
F(x0, ..., xn-1) := T,it suffices to prove G[x <- T[x0 <- a0, ..., xn-1 <- an-1]]:
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K union {forall x0, ..., xn-1: F(x0, ..., xn-1) = T} G[x <- F(a0, ..., an-1)]
K union {forall x0, ..., xn-1: F(x0, ..., xn-1) = T} G[x <- T[x0 <- a0, ..., xn-1 <- an-1]]
Insert the definition of the function!