Sometimes I do read in a sentence:
some statement iff another statement
At first I thought it is a mispelling, but then I realized, that I do encounter this at many different posts. Does this mean equivalence?
Sometimes I do read in a sentence:
some statement iff another statement
At first I thought it is a mispelling, but then I realized, that I do encounter this at many different posts. Does this mean equivalence?
http://en.wikipedia.org/wiki/If_and_only_if using google helps a lot sometimes.
As Zhen Lin already mentioned, "iff" is shorthand for "if and only if". Also in french literature one can find "ssi", which means "si et seulement si".
Using your example:
some statement iff another statement.
This is a short-hand way of combining the "if-then" form of a statement, and its converse or the vice versa statement when they are both true:
or
some statement, if another statement (1)
or
another statement, if some statement (2)
Combining (1) and (2) gives:
some statement iff another statement.