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) = a^x, 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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