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Proposition: If P⟹Q and Q⟹R are theorems, then P⟹R is also a theorem. (not using a...

Proposition: If P⟹Q and Q⟹R are theorems, then P⟹R is also a theorem. (not using a truth table only using rules 1-4, theorem 1 and axioms 1-4) Hilbert system

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