Definition of "definition": use iff or if?
7871
Are "if" and "iff" interchangeable in definitions?
102641
ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?
69495
Difference between \if and \ifx
71634
Can a variable be defined only in the scope of an if-statement, similar to how it's often done for for-loops?
148617
If something was vs If something were
85034
"If something was" vs "If something were"
32293
What's the difference between if(!$variable) and if(isset($variable))?
2182
vs. . Which to use?
17739
Which "mean" to use and when?
38716
Is there a difference between “?!” and “!?”?
117928
Is “between __ or __” valid?
62172
Why does $-b < a < b \iff |a| < b$?
128094
Using "was" vs "were" for "as if"
93327
Negation of if and only if?
154165
Is there a better way to define more conventional if...then...else notations?
22352
? (Definition) versus ?? (Information)
105797
Why can't we define a variable inside an if statement?