以 e 开头的数学词汇 | 玄数

2012-10-07
(Euler’s Number)   欧拉常数

γ ≈ 0.57721566490153286060

eccentricity   离心率
Denoted e or ε, is a parameter associated with every conic section. It can be thought of as a measure of how much the conic section deviates from being circular.

(1 – e2) x2 + y2 – 2pe2x – p2e2 = 0

edge   边缘
The outside limit of an object, a surface or an area; The part furthest from the centre.

element   元素

  • a. A member of a set.
  • b. A point, line, or plane. A part of a geometric configuration, such as an angle in a triangle.
  • c. The generatrix of a geometric figure.
  • d. Any of the terms in the rectangular array of terms that constitute a matrix or determinant.

ellipse   椭圆
A closed, symmetric curve shaped like an oval, which can be formed by intersecting a cone with a plane that is not parallel or perpendicular to the cone’s base. The sum of the distances of any point on an ellipse from two fixed points (called the foci) remains constant no matter where the point is on the curve.
椭圆

engineering notation   工程计数法
A version of scientific notation in which the exponent of ten must be divisible by three. As an alternative to writing powers of 10, SI prefixes can be used, which also usually provide steps of a factor of a thousand.On calculators, engineering notation is named “ENG”.

enlarge   扩大
To increase the size, amount, or extent of something, or become larger.

equal   等于, 相等的
Being the same or identical to in size, quantity, value, or standard.

equal sign   等号
symbol: =

equality   相等
A statement that two quantities are equal; equation.

equation   方程
A mathematical statement that two expressions, usually divided by an equal sign, are of the same value.
equation

equation of a straight line   直线的方程
equation of a straight line