Difference between "if and only if" and "but not otherwise"?

rebelwithoutaclause · July 2019

From a logic perspective (see below) I can't work out any meaningful differences, but I noticed that JY splits these off in his map of bi-conditional statements. Am I missing something?

A ↔ C
/A ↔ /C

MIT_2017 · July 2019

He probably just does it to be more explicit. You're not missing anything.

rebelwithoutaclause · July 2019

Thanks for confirming

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