411 REFERENCE · Wiktionary
Iverson bracket
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named after Kenneth E. Iverson, who introduced this notation in his programming language APL.
Noun
en 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)
en eponyms