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A number in square brackets, naming a whole class of numbers.
Also known as: Equivalence class notation, Residue class, Bracket notation for classes
A number in square brackets denotes its equivalence class: every number related to it under the relation in force. In modular arithmetic that means every number leaving the same remainder, so the bracketed three stands for an infinite set rather than a single number.
Denotes the equivalence class of the enclosed element under the equivalence relation currently in force.
Contexts: Mathematics
Names an infinite set in modular arithmetic — every integer with the same remainder — rather than the single number written inside.
Contexts: Mathematics
A numeral enclosed by two square-cornered brackets, each a vertical stroke with short arms turned inwards.