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Math Glossary Letter E
earnings before interest and taxes
noun
Earnings Before Interest and Taxes

Revenue - Operating Expenses
EBIT
noun
Earnings Before Interest and Taxes

Revenue - Operating Expenses
eccentricity
noun
Deviation of a conic from a circular shape
economics
noun
study of production, distribution, and consumption of goods and services
edges
noun
line segment joining two vertices
effective annual yield rate
noun
Yield rate taking compounding periods into effect
effective interest rate
noun
the return on an investment or the rate owed in interest on a loan when compounding is taken into account.
eigenvalue
noun
set of scalars associated with a linear system of equations
elapsed time
noun
Amount of time between two dates
elasticity
noun
the change in the behavior of buyers and sellers in response to a price change for a good or service
electric
noun
the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge.
element
noun
an element (or member) of a set is any one of the distinct objects that belong to that set. In chemistry, any substance that cannot be decomposed into simpler substances by ordinary chemical processes.
elevation
noun
height above a given level, especially sea level
eliminate
noun
to remove, to get rid of or put an end to
elimination
noun
Eliminating a variable in a system of equations to solve for another variable or variables
elimination method
noun
Eliminating a variable in a system of equations to solve for another variable or variables
ellipse
noun
a regular oval shape, traced by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant
empirical rule
noun
Provides estimate for the spread of data in a normal distribution. 68% of the data will fall within one standard deviation of the mean. 95% of the data will fall within two standard deviations of the mean. 99.7% of the data will fall within three standard deviations of the mean
empty set
noun
The set with no elements

encryption
noun
encoding a message such that anybody outside authorized parties cannot read it
endpoint
noun
end of a ray, line segment, or interval
energy
noun
property that must be transferred to an object in order to perform work on
engineering
verb
the application of science and mathematics by which the properties of matter and the sources of energy in nature are made useful to people
entropy
noun
refers to disorder or uncertainty
epsilon
noun
A letter of the greek alphabet used for math notation.

Ε  ε
equal
noun
being the same in quantity, size, degree, or value

=
equality
noun
The state of being equal. A relationship between two quantities or two mathematical expressions, asserting that the quantities have the same value, or that the expressions represent the same mathematical object
equated time
noun
determine time from cash flow streams
equation
noun
a statement declaring two mathematical expressions are equal
equation of a circle
noun
formula to graph a circle and the points on the circle

(x - h)2 + (y - k)2 = r2
equation of a line
noun
formula to graph the points on a line

y = mx + b
equation of a plane
noun
formula to graph the points in a plane

Ax + By + Cz + D = 0
equation of exchange
noun
equation relating money, price, velocity, and quantity

MV = PQ
equilateral triangle
noun
A triangle with 3 equal sides
equivalence
noun
the state or property of being equivalent.
equivalent
noun
equal in value, amount, function, meaning
equivalent annual cost
noun
formula comparing two different projects to see which one is more valuable
equivalent coordinates
noun
Relating cartesian and polar coordinates
equivalent expressions
noun
see equations
equivalent fractions
noun
Two fractions with equal values, using a common factor to scale the numerator and denominator
error
noun
difference between an observed value and the true value of a measurement.
estimate
noun
an approximate calculation or judgment of the value, number, quantity
estimate sum
noun
Using rounding to estimate the total of numbers using their rounded figures
estimation
noun
rough calculation of a number or quantity
eta
noun
A letter of the greek alphabet used for math notation.

Η  η
euclidean norm
noun
magnitude or length of a vector
euclids algorithm
noun
method for computing the greatest common divisor (GCD) of two numbers
euclids extended algorithm
noun
division algorithm for integers
euler
noun
Famous mathematician who developed Euler's constant
Eulers Constant
noun
limiting difference between a harmonic series and natural logarithm

0.5772156649
Eulers Formula
noun
Equation relating 5 mathematical constants

e + 1 = 0
eulers totient
noun
the number of positive integers that are relatively prime to
evaluate
noun
To calculate the value of
even number
noun
a whole number that is able to be divided by two into two equal whole numbers
even numbers
noun
Numbers divisible by 2
event
noun
a set of outcomes of an experiment to which a probability is assigned.
evil numbers
noun
A number with an even number of 1s in the binary expansion
exabyte
noun
multiple of the unit byte for digital information
exact time
noun
excel
noun
exchange matrix
noun
row-reversedr or column-reversed version of the identity matrix
exchange rate
noun
The rate to convert one unit of currency to another unit of currency
exercise price
noun
the price at which an underlying security can be purchased or sold when trading a call or put option
expand polynomials
noun
Write out the multiplication of polynomials term by term
expanded notation
noun
Writing out a number to show the sum of each digit multiplied by the place value

9256 = 9(1000) + 2(100) + 5(10) + 6(1)
expected
noun
results or observations that are predicted
expected frequency
noun
computed by multiplying the probability that an event occurs by the total number of possible times that the event could occur.

Expected Frequency = (Row Total * Column Total)/N
expected return
noun
amount of profit or loss an investor anticipates on an investment
expected value
noun
predicted value of a variable or event

E(X) = ΣxI · P(x)
expense
noun
the cost required for something; the money spent on something. A financial burden or outlay
experiment
noun
In statistics, a controlled and repeatable process
experimental value
noun
the value that is measured during the experiment.
exponent
noun
The power to raise a number
exponential
noun
of or relating to an exponent
exponential distribution
noun
probability distribution that describes the time between events in a Poisson point process
exponential fit
noun
Fit a curve to a set of data using an exponential function
exponential growth
noun
growth whose rate increase in proportion to the total number
exponential identity
noun
Identity using exponents for equivalent expressions
exponential smoothing
verb
Create smoothed data using exponential functions

αxt - 1 + (1 - α)st - 1
export
noun
movable goods produced within the boundaries of one country, which are traded with another country
exports
noun
goods and services produced in one country and purchased by citizens of another country
expression
noun
finite combination of symbols
exterior angle
noun
the angle between a side of a rectilinear figure and an adjacent side extended outward.