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