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icosahedron
icosaèdre m

Iconohedron. A polyhedron with 20 faces. A regular icosahedron consists of 20 equilateral triangles.

identity
identité f

Identity. The identity of a set S with a binary operation * is the ith member of the set if it is added to any other number in the set without changing anything:

XES for each j*x=x*i=x

For example: In addition, 0 is the identity, since:

7 = 7+0 and 2 = 2-+0- and 150 = 150+0 ...

And so on.
In multiplication, 1 is the neutral, since: 7=7×1 and 1×-2=2- and 1×19 = 19 ... and so on.

For sets under the union operation, the neutral is the empty set:

For matrices 2×2, the neutral is:

In the operation below b is the neutral:

Note: Row "b" is the same as the top row in the table, and column b » is the same as the left column in the
table.

image
image f

Image. The result of applying a function to a certain member of the domain is called the image of that element. For example: 7< 2, 3 + x2 < x. The number 7 is said to be the image of the number 2, which is called the object.

This term is often applied in geometry to the result of a transformation.

imaginary
imaginaire

Imaginary. The imaginary part of a complex number a+bi is b. For example: The imaginary part of 3+4i is 4.

improper
composé

Impaired. An improper fraction is a fraction whose numerator is greater than its denominator.

Such as 17/6, 8/3, 13/4, etc.

An improper fraction can be changed to a mixed number

For example: 17/6-25/6 and 3 1/4=13/4

inch
pouce f

inch. inch. A unit of length. A foot equals 12 inches, and an inch is slightly larger than 2.5 centimeters.

incircle
circonférence f inscrite

An internal circle in the triangle below has bisected the angles. All the bisectors meet at a single point 0 called the "incentre" of the triangle.
If 0 is taken as the center, a circle can be drawn that touches the sides of the triangle. This circle is called an inner circle or a circle

inscribed triangle.

independent

independent. The equation 2x+5 =y defines y as a function of x. It is an independent variable for the function (and y is the dependent variable).

In the equation s= 2t2+3t-5 the independent variable is t.

index
indice m

Power. As in the number 23, 3 is called the power.
When numbers are multiplied or divided, the following rules apply:

xaxxb = xa+b The base is added when multiplying.

xa÷xb=xa-b The base is subtracted when dividing.

. (xa)b = xab

Using these rules, negative and fractional bases can be extracted:

Also, 1=x0 for any number represented by x.

When the number (16) is written, for example, in the form 24=16, it is said to be written in exponential form.

Similarly:

2 × 2 × 2 × 2 × 3 × 3 × 5 =
360
= 23x32x51