June 2010 LSAT Section 5 Question 14

The author uses the word "immediacy" (line 39) most likely in order to express

Bradley-Saunders on April 5, 2022

Contrapositive on "If and only if" with one negative

Let's say you have the statement "A if and only if not B." The diagram would be A <-> not B. Would the contrapositive be not A <-> B? If you could explain the logic behind this, that would be greatly appreciated.

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Emil-Kunkin on April 15, 2022

Hi Bradley,

I would start this by breaking this out into the if and then only if.

the "if" is

If Not B - A
the contrapositive of this is
If Not A - B

The only if is "A only if Not B"

If A - Not B
If B -Not A