MATH DICTIONARY

E

e:  2.718281828.....  The base of the natural logarithm function.  e can be found from the series

2 + 1/2! + 1/3! + 1/4! + 1/5! + ...........

eccentricity:    A number that indicates the shape of a conic section.   The eccentricity of

an

ellipse is given by

e  =  sqrt(a2 - b2)
a

element:   a member of a set.

ellipse:  the set of all points in a plane such that the sum of the distances to two fixed

points

is a constant.   The equation of an ellipse with center at the origin is

x2   +  y2     =     1
a2         b2

ellipsoid:   a solid of revolution formed by rotating an ellipse about one of its axes.

empty set:   a set that contains no elements.

equation:   a mathematical statement that says that two expressions have the same value.

equilateral triangle:   a triangle that has three equal sides.

equivalent equations:   two equations whose solutions are the same.   For example:

x + 3y = 10,   and   2x + 6y = 20.

even function:  a function that satisfies the property that f(x) = f(-x).

even number:  a natural number that is divisible by 2.

event:  in probability, a set of outcomes.

exponent:  a number that indicates the operation of repeated multiplication.

exponential function:  a function of the form f(x) = ax, where a is a constant known as the

base.

extremum:  a point where a function reaches a maximum or a minimum.

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