Processing math: 68%

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Abuse of Parentheses

Notationally, parantheses seem to be very popular. Almost too popular. The following is a collection of all the different notations that I've found paranthesis used for. If you would like to add one, send me a pull request on Github.

Name Usage Locations (non-exhaustive)
Function application The value f(2) is, oddly, ... Mathematics, programming
Precedence 2+(35)(2+3)5 Mathematics, programming
Parentheticals The man (who wore flannel) began ... Writing
Ideal (N):={kNkZ} Ring Theory
Tuples (x,y)=(0.5,1.7) Mathematics, programming
Indexing item = my_list(i) MATLAB
n-dimensional sequences Consider the sequence (aij) ... Mathematics
Multiplication (5)(17)=85 Mathematics
S-Expression (f x y z) Lisps
Interval notation ...so for any x in [0,+) we have ... Mathematics
n choose k {n \choose k} = \frac{n!}{k!(n-k)!} Mathematics
Matrices I_2 := \left( \begin{matrix} 1 & 0 \\ 0 & 1 \end{matrix} \right) Mathematics
Greatest common divisor (a, b) := \mathit{gcd}(a, b) Mathematics
Generator expression (f(x) for x in li) Python
Function shorthand (+), (+2), (3*) Haskell
Congruence 5 \equiv 15\ (\text{mod } 10) Mathematics
Labels See example (B) or refer back to (II) to... Writing
Unit () Haskell
Enumeration Two things: 1) ...; and 2) ... Writing
Emoticon :)    :(    ;)    :'( Texting
Permutation Cycles (1 3)(2)(4 6 5) Mathematics