https://en.wikipedia.org/wiki/If_and_only_if
As a non-native speaker, it took some years before I realized the use of “iff” is not a typo. Kind regards, Job
https://en.wikipedia.org/wiki/If_and_only_if
As a non-native speaker, it took some years before I realized the use of “iff” is not a typo. Kind regards, Job