(追記) (追記ここまで)
Absolute Value
Absolute value makes a negative number positive. Positive numbers and 0 are left unchanged. The absolute value of x is written |x|. We write |–6| = 6 and |8| = 8.
Formally,
the absolute value of a number is the distance between the
number and the origin. This is
a much more powerful definition than the "makes a negative number
positive" idea. It connects the notion of absolute value to the
absolute value
of a complex number and the magnitude
of a vector.
See also