Mathematics. Dictionary

Edge · E

A one-dimensional face of a polytope. In particular, the joining line between two vertices of a polygon; the place where two faces of a polyhedron meet.

Ellipse · E

A closed curve, the locus of a point such that the sum of the distances from that point to two other fixed points (called the foci of the ellipse) is constant; equivalently, the conic section that is the intersection of a cone with a plane that does not intersect the base of the cone.

Endpoint · E

Either of the two nodes of a graph of degree 1.

Equal · E

Exactly identical, having the same value.

Equation · E

An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; in mathematical problems, equations describe various essential aspects of the problem, each of which contributes to the resolution of the problem in part.

Equilateral triangle · E

A triangle having all three sides equal.

Estimate · E

A rough calculation or assessment of the value, size, or cost of something.

Even number · E

An integer that is divisible by two.

Exponent · E

The number by which a value (called the base) is said to be raised to a power in exponentiation: for example, the 3 in 2^3=8.

Exponential · E

Any function that has an exponent as an independent variable.

Expression · E

An arrangement of symbols denoting values, operations performed on them, and grouping symbols.

Exterior angle · E

An angle formed between one side of a polygon and an extension of an adjacent side.