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Q. The symbol _________ indicates material equivalence.

Q. If (∃ x ) x . Mx ) is true, then (x) ( H x Ͻ Mx ) is ………………..

Q. . p . q) is logically equivalent to …………………………………..

Q. Two statements are ………………… when their material equivalence is a tautology

Q. If the specific form of a given argument has any substitution instance whose premises are true and whose conclusion is false, then the given argument is.

Q. ’statement form from which the statement results by substituting a different simple statement for each different statement variable’ is called ……………………..

Q. The negation of a true statement is ---------

Q. ‘An Investigation of the Laws of Thought’ is the work of -----

Q. If (x) ( H x Ͻ Mx ) is false , then (∃ x ) x . Mx ) is …………………………

Q. ‘Socrates is a Philosopher’ is a -------- proposition