# Domain and range in Sage Math

How do i find the domain and range in Sage Math of a function:

```
f(x) = x/(x^2-1)
g(x) = e^(-x^2) ?
```

Domain and range in Sage Math

How do i find the domain and range in Sage Math of a function:

```
f(x) = x/(x^2-1)
g(x) = e^(-x^2) ?
```

add a comment

0

0

Hello,

Be careful that your question is not well defined. In the definition of a function there is already a domain and a codomain (and the range is a subset of the codomain). In particular it makes no sense to compute the domain.

I guess that what you meant is : on which set of numbers the expression XXX is valid ? Remark that this is relatively subtle because an expression like

```
(x^2 - 1) / (x^2 - 1)
```

is not well defined at x=1 since 0 / 0 is not defined.

The question is still not well defined since you might want to consider this expression over the real numbers, the complex numbers, the Riemann sphere or something even more complicated. Depending on the question, you have first to see where the expression makes sense and then to compute the range. For this last computation Sage can currently not help.

Vincent

Asked: **
2014-10-26 08:51:29 -0500
**

Seen: **1,922 times**

Last updated: **Oct 26 '14**

Determine domain and range of linear equation?

Limiting the display range of a 3d plot

Sage Math Cloud Plotting Error, ValueError: cannot convert x to int

Getting range from things which aren't integers yet, but will be

range, xrange and ellipsis iteration.

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.