Summation
∑
Type it
| Unicode | U+2211 | |
|---|---|---|
| LaTeX | \sum | |
| HTML entity | ∑ | |
| Character | ∑ |
Meaning
Adds up a sequence of terms. The index and its range are written below and above the sign. Compare with Product and Capital Sigma.
How to read it
∑ₖ₌₁ⁿ k
is read “the sum of k for k from one to n”.