i don't understand why this notation is the same thing as(adsbygoogle = window.adsbygoogle || []).push({});

"A only if B"

to me "A only if B" reads that A is a consequence of B but of course it actually means the reverse.

same thing with A<->B being stated as

"A if and only if B"

to me this reads that again A is a consequence of B and is only true when B is true. I don't understand how it tells anything about B or how you read the reverse implication from it, as far as english goes.

woops i meant this for general math, wasn't looking.

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# A -> B

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