Undefined terms
To avoid circular definitions, it is necessary to include
certain terms without specific mathematical definition. Union
 Unit circle
A circle with radius 1 centered at the origin. Unit distance
The distance between 0 and 1 on a number line. Unit scale
The distance between the points marked 0 and 1 on a number
line. United States
system The measurement system used in the United
States. Universal set
The set that contains all of the elements under consideration
for a problem or a set of problems. Unless
 Unrestricted
domain Any set of rankings is possible; if there
are n candidates, then there are n! possible rankings. Unstable marriage
A pairing in which one (or both) of the partners would prefer
to be paired with another partner. Upload The process
of copying a program from your computer to the network. Upper Quota
In apportionment, the result of a quota found by rounding
up. User-friendly
A term used to describe software that is easy to use. It
includes built-in safeguards to keep the user from changing
important parts of a program.
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