A pilaster is a projecting column built into the face of a wall. It is meant only to give the appearance of a supporting column. It is entirely ornate however, and has no role in the structural integrity of the building.
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It is the function for which all the elements of the range of the function corresponds to exactly one element of the domain.
it is a function to where every element in the range equals exactly one element in the range, or for every x there is exactly one f(x)
A Function
When it doesn't fulfill the requirements of a function. A function must have EXACTLY ONE value of one of the variables (the "dependent variable") for every value of the other variable or variables (the "independent variable").
Function