from range restriction to domain restriction
- To: mathgroup at smc.vnet.net
- Subject: [mg72590] from range restriction to domain restriction
- From: "Chris Chiasson" <chris at chiasson.name>
- Date: Thu, 11 Jan 2007 03:16:39 -0500 (EST)
If I wanted to ensure that Sqrt[x] was always a real number, perhaps
as a condition on Piecewise, I would say Im@Sqrt@x==0 (or
Element[Sqrt@x,Reals], but Mathematica doesn't like to simplify that).
In my real case, x isn't a symbol - and it comes from the output of
some other commands. However, I also know that Element[x,Reals], so I
was wondering if there is a way to make Mathematica do the following:
(part of) input:
If someone knows how to do this (other than the obvious Cases +
pattern transformation), I would appreciate being told how. Thank you.
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