Noun
Iverson bracket (plural Iverson brackets)
(mathematics) A notation that denotes a number that is 1 if the condition in square brackets is satisfied, and 0 otherwise, i.e. (where P is a true or false statement)
[
P
]
=
{
1
if
P
is true;
0
otherwise.
{\displaystyle [P]={\begin{cases}1&{\text{if }}P{\text{ is true;}}\\0&{\text{otherwise.}}\end{cases}}}