# Math Dictionary n

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**nth root :**If the power is 1/2 then we call it as square root, if the exponent is 1/3 then we call it as cube root but if the exponent is other than 1/2 and 1/3 then we call it as 'nth root'. For example: 2

^{1/4}then it is 4th root of 2.

**Natural logarithm :**It is a logarithm with base 'e'. The value of

e = 2.718281828.

**Natural Number :**The whole numbers from 1 upwards: 1, 2, 3, and so on ...

**Negative :**Less than zero. A negative number is written with a minus sign in front ( -5).

**Negative exponent :**When the power of any number is negative then it is called negative exponent. For example : 5

^{-2}.

**Negation:**For any given statement p , its negation is the statement , ~ p (not p ) whose truth value is the opposite of the truth value of p .

**Net:**A two dimensional pattern consisting of polygons which can be folded to form a polyhedron.

**N-gon:**A polygon with n sides.

**Nonagon:**A polygon with 9 sides.

**Non-collinear points:**Three or more points that do not lie on the same line.

**Non- coplanar points:**Four or more points that do not lie on the same plane.

**Non-Euclidean geometry:**A geometry that contains an axiom which is equivalent to the negation of the Euclidean parallel postulate.

**Non-Parallel:**Intersecting lines.

**Not equal :**Opposite of equal and it is denoted by ≠

**Number line :**A line with numbers placed in their correct position.

**Number Pattern :**A list of numbers that follow a certain sequence or pattern.

**Number Sense :**A person's ability to use and understand numbers.

**Number system :**Number system is categorized into different types of numbers such as whole numbers, rational numbers, integers etc.

**Numeral :**A symbol or name that stands for a number.

**Numerator :**The top number in a fraction.

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