Iff is a concept that I somewhat have an obsession for. If stands for "If and **only** if". The precision of the concept is something I like, very much. It's represented by $\iff$. Iff specifically means that if the first case is true, the second must be. It shares this with *if*. However, *iff* has an additional constraint. If A is false, then B must also be false. In other words, *iff* represents equivalency, but expressed in one way as the precondition, and the result. This means that since it's equivalent, you can re-write *iff* backwards. >[!example] Symbolically $A \iff B$ is equal to $B \iff A$ ## Uses * [[Floating Origin]] to represent the relationship between chunk locality. #grow # References