1 | initial version |

Given the syntax of the `sum()`

function, which can be read by executing "`sum?`

" (with the question mark) in the Sage notebook, you don't need to define a list to compute the sum. For example,

```
sage: var('x')
sage: f = x^2 # note that you don't write f(x) = x^2
sage: sum(f,x,0,4)
30
```

Also, be careful defining a variable, `x`

, as well as a list with the same name. (You write `f = x^2`

as well as `x=[0,1,2,3,4]`

.) Hope this helps.

2 | Clarified parenthetical remark. |

Given the syntax of the `sum()`

function, which can be read by executing "`sum?`

" (with the question mark) in the Sage notebook, you don't need to define a list to compute the sum. For example,

```
sage: var('x')
sage: f = x^2 # note that you don't write f(x) = x^2
sage: sum(f,x,0,4)
30
```

Also, be careful defining a variable, `x`

, as well as a list with the same name. (You ~~write ~~wrote `f = x^2`

as well as `x=[0,1,2,3,4]`

.) Hope this helps.

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.