(追記) (追記ここまで)
Ceiling
Function
Least Integer Function
A step function of x which is the least integer greater than or equal to x. The ceiling function of x is usually written . Sometimes this function is written with reversed floor function brackets , and other times it is written with reversed boldface brackets ]x[ or reversed plain brackets ]x[.
Examples: and .
See also
Floor function (also called greatest integer function)