__I__

**Improper
fraction **A positive fraction whose numerator is greater than or equal to its
denominator, or the

**Independent
events** Events that have no effect on each other.

**Indirect
measurement **A measurement in which no direct comparison is made between the
object being

measured
and a physical standard. Or, a
measurement obtained by calculation

**Inequality
** A mathematical sentence formed by placing an inequality
sign between two expressions.

**Infinite
set **A set with an unlimited number of elements

**Integers
** The whole numbers and their opposites: . . . -2, -1,
0,1,2 .........

**Interest
** The amount of money paid for the use of money.

**Interpolation
** A method of
approximation.

**Intersecting
lines **Two straight lines that have one and only one point in common

**Intersecting
planes **Two planes that have one and only one line in common

**Intersection
**(of sets) The set of all elements which belong to both of two sets. ,P n
Q" is read "P intersection Q"

**Inverse
operations ** Operations
that undo each other, such as addition and subtraction or multiplication and
division.

**Irrational
number ** All real numbers
that are not rational.

**Isosceles
triangle** A triangle with at least two sides congruent.