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Domain and range in Sage Math

asked 2014-10-26 14:51:29 +0200

masac gravatar image

updated 2014-10-26 17:41:15 +0200

vdelecroix gravatar image

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) ?
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answered 2014-10-26 17:59:31 +0200

masac gravatar image

updated 2014-10-26 18:01:22 +0200

Thank you. Domain/ Range I try to do the same operations in Sage.

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answered 2014-10-26 17:47:52 +0200

vdelecroix gravatar image


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.


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Asked: 2014-10-26 14:51:29 +0200

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Last updated: Oct 26 '14