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brackets without a top, what do they mean?

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What does the mathematical symbol that resembles brackets, [ or ], only *without* the line at the top. In other words, they look like a capital L and a reversed capital L. What do they mean? This type of thing is difficult to search on Google.

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http://www.barzilai.org/math_sym.htm
http://www.gomath.com/htdocs/ToGoSheet/Algebra/mathsymbols.html

You mean perpendicular symbol?

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They refer to the floor and ceiling functions for real values, if there's no top it's the floor function, if there's no bottom it's the ceiling function.

[Edited by - digitec devil on November 23, 2004 4:17:58 PM]

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These symbols mean "floor" and "ceiling" and cap the included expression to the nearest integer value. "Floor" to the next integer, smaller than the expression, "ceiling" to the next largest.

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