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What does the horizontal line m mean in mathematics?
The horizontal symbol of m is used as a summation symbol in mathematics. For example: ∑Pi, where i= 1, 2, ..., t, which is the sum of P 1+P2+ and ...+angle.

The ∑ symbol means sum, and the ∑ pronunciation is sigma, which means sum and sum in English.

The method of summing with sigma is called Sigma Notation.

The usage expression of ∑ is as follows:

Where I stands for the lower bound, n stands for the upper bound, and k starts from I and goes all the way to n, all of which add up.

∑ i can also be expressed as the sum of I, which is a variable.

Extended data:

∑ is the eighteenth Greek letter. In Greek, if the last letter of a word is lowercase sigma, what should it be written as? This letter is also called final sigma(Unicode: U+03C2). In modern Greece, this number stands for 6.

Its lowercase is σ, which is often used in physics to represent the area density. (Therefore, ρ stands for bulk density and η stands for linear density)

The term σ is used to describe the distribution or dispersion of the average value of any process parameter.

Chemically, surface tension (σ)(sigma) refers to the force that molecules on the surface of a liquid shrink inward to the smallest area.

Chemically, it also refers to the σ bond formed by two electron clouds "head to head" along the orbital axis.

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