to all the philosophy/and or possilbly other major students

[ucbalumnus]

@mynamesnotfred

please reread what I wrote. “B can only occur if and only if A occurs” translates to A → B not the other way around.

You used “if and only if” rather than “if” or “only if”. This means that A and B are equivalent, i.e. A → B and B → A.