Glossary - N's Natural base The natural base is e; it refers to an exponential with a base e.Natural logarithm A logarithm to the base e, written ln N .Natural numbers N = {1, 2, 3, 4, 5, ... } the positive integers, also called the counting numbers.Negation A logical connective that changes the truth value of a given statement.  Negative number A number less than zero.Negative sign  The symbol " - " when used in front of a number, as in -5.  Do not confuse with the same symbol used for subtraction. Network (1) A linking together of computers. (2) A set of points connected by an arc or by line segments.New Sates Paradox When a reapportionment of an increased number of seats causes a shift in the apportionment of existing states, it is known as the new states paradox.n-gon A polygon with n sides.Nonagon A polygon with 9 sides.Nonconformable matrices Matrices that cannot be added or multiplied because their dimensions are not compatible.Non-Euclidean geometry A geometry that results when Euclid's fifth postulate is not accepted.Nonrepeating decimal A decimal representation of a number that does not repeat.Nonsingular matrix A matrix that has an inverse.Nonterminating decimal A decimal representation of a number that does not terminate.Normal curve A graphical representation of a normal distribution. Its high point occurs at the mean, it is symmetric with respect to this mean, and on each side of the mean has an area that includes 34.1% of the population within one standard deviation, 13.6% from one to two standard deviations, and about 2.3% of the population more than two standard deviations from the mean.Not A common translation for the connective of negation.NOT-gate A logical gate that changes the truth value of a given statement.Null set See Set.Number A number represents a given quantity, as opposed to a numeral, which is the symbol for the number. In mathematics, it generally refers to a specific set of numbers; for example, counting numbers, whole numbers, integers, rationals, or real numbers. If the set is not specified, the assumed usage is to the set of real numbers. Number line A line used to display a set of numbers graphically (the axis for a one-dimensional graph).Numeral Symbol used to denote a number.Numeration system A system of symbols with rules of combination for representing all numbers.Numerator See Rational number.Numerical coefficient See Coefficient.