Mathematical "N" Words
natural number Any one of the numbers 1, 2, 3, ... . Also called positive integer. These are sometimes called "counting numbers".
A figure has n-fold rotation symmetry, where n is a positive integer,
when a rotation of magnitude 360/n maps the figure onto itself,
and no larger value of n has this property.
negation of a statement A statement (called not p, and represented by ~p) that is true whenever statement p is false and is false whenever statement p is true.
negative integer Any one of the numbers -1, -2, -3, ... .
negative number A number which is the opposite of a positive number.
nested parentheses Parentheses which are inside other parentheses. Nested parentheses indicate which operations are to be performed first. You always work inside the INNERMOST parentheses first.
A two-dimensional figure that can be folded on its segments or curved
on its boundaries into a three-dimensional surface.
A union of points (its vertices or nodes) and segments (its
arcs) connecting them. Also called graph.
node An endpoint of an arc in a network.
A set in which at least one segment that connects points within the set
has points that lie outside of the set.
non-Eclidean geometry A geometry in which the postulates are not the same as those in Euclidean geometry.
nonoverlapping regions Regions that do not share interior points.
The set with no elements. Also called empty set.
number line A line in which the points, in order, correspond to numbers in order.
numerator a in the fraction a/b. Remember that a fraction is a division problem. The top number, the numerator, is the number being divided, the fraction bar is the division symbol, and the bottom number, the denominator, is the number of equal parts that you are dividing the top into.
numerical expression A collection of numbers and operation symbols, without an equal sign, that represents a number.
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