a) ∃!xP(x) → ∃xP(x) b) ∀xP(x) → ∃!xP(x) c) ∃!x¬P(x)→¬∀xP(x) I am unable to get any idea how to approach this question ,so plz guide..

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If the UNIX, when is allowed to run on another machine then it needs c compiler for it ,so when we install the compiler for it ,then is that a...