How do you create square brackets that don't have the top or bottom feet? I'd like to use the symbol to define an operator for half-wave rectification.



Use a vertical bar (|) for brackets without any feet at all, \lfloor/\rfloor for the floor function (bottom feet only), or \lceil/\rceil for the ceiling function (no bottom feet, top feet only).

See p. 146 - 147 of the TeXbook for more information.

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