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What is the usage of the ∑ symbol?
The ∑ symbol means sum, and the ∑ pronunciation is sigma, which means sum and sum in English.

Examples of Usage of 1 and ∑

The method of summing with sigma is called Sigma Notation. Its lowercase is σ, in kind.

Theoretically, it is often used to express area density. (Therefore, ρ stands for bulk density and η stands for linear density)

2. The usage of ∑:

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

∑ bid and bid mean:

1, superscript: n represents the upper bound, which refers to the elements in a poset that are greater than or equal to all the elements in its subset.

2. Subscript: I stands for the lower limit. If a set of real numbers M has a real number S, so that any number in M is greater than S, then S is called a lower bound of M. ..

Examples are as follows:

100/ upper limit n

∑ i = 1+2+3+4+5+ + 100

I= 1↘ lower bound I

200

∑ i = 5+6+7+8+9+......+200

i=5