Mathematics
In mathematics, the absent referent can be seen with the symbol for zero, "0" or the empty set, "{ }".
A reference point in Geometry is a location used to describe another point, by giving the relative position. Similarly there is the concept of frame of reference (both in physics and figuratively) and benchmark (in surveying and figuratively).
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Famous quotes containing the word mathematics:
“I must study politics and war that my sons may have liberty to study mathematics and philosophy.”
—John Adams (1735–1826)