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Take sets A0, ..., Ai-1, Ai+1, ..., An-1.
The definition introduces the predicate
p subset A0 x ... x Ai-1 x N x Ai+1 x ... x An-1that satisfies
for all x0 in A0, ..., xi-1 in Ai-1, xi in N, xi+1 in Ai+1, ..., xn-1 in An-1.
p(x0, ..., 0, ..., xn-1) <=> Tb /\ p(x0, ..., xi+1, ..., xn-1) <=> Tr