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e
e

It is the symbol given to the irrational numbers that are the base of the natural logarithm function. It is a fundamental constant in the worlds of mathematics and physics. e = limit (1+1/n)n when n increases. And with ten decimal places, then

. e = 2.7182818284 :

The unique property of the function v=e is that the gradient of its graph for any value of x is identical to the value of the function at that value, i.e.: dy/dx=y

Thus, the volume of any quantity that grows or decays at a rate directly proportional to its volume in a given time is related to the number e.

eccentricity
excentricity f

The ratio of the distance of any point on the curve from the focus to the distance of the same point from the directrix is ​​called eccentricity.

When 1 > the conic section is an ellipse.
e<1

When 1= the conic section is a parabola
e=1

When 1 < the conic section is a hyperbola
e>1

edge
côté m

Letter. Side. A line formed by the intersection of two faces in a polyhedron.

element
élément m

A triangular pyramid has six faces
A rectangular parallelepiped has twelve faces

Element. The individual members of a set of elements are called . For example: For example:

Red is an element in the set of primary colors.
7 is an element in the set of odd numbers (chords).
The symbol = means (element of) in the group notation,
so 7 is the odd number.

elevation
élévation f

Height. My vertical projection. 1 - The angle of elevation of an object
For an observer looking at the object from below is the angle between the line connecting the object to the observer and the horizontal plane.

The angle of elevation of the aircraft seen here from the radar site is 25°.

2 - In engineering and mechanical drawings, the vertical projection of a solid object is its view from the front or side.