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IMP is “material implication” “a implies b” or “if a then b”, which is equivalent to NOT a OR b. EQV is “equivalence” or “if and only if”, so a EQV b is the same as (a IMP b) AND (b IMP a).
They got there because someone wanted to be complete. They can shorten some logical expressions, but you can always express the same thing with NOT and AND, NOT and OR, or with XOR alone.