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Re: Domain of a function

On 27 Nov 2011, at 10:14, Tutor wrote:

> Element[x | Sqrt[2 + x], Reals]; what exactly does "|" in this case?

The first argument of Element can be a pattern and the assertions is 
that everything that matches the pattern is real. So what kind things 
match the pattern? For one, x matches it. Also, Sqrt[2+x] matches it and 
nothing more does. In other words, both x and Sqrt[2+x] must be real.

Andrzej Kozlowski

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