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Re: How do I pick out the expression under a radical?

"Steve Beach" <asb4 at> wrote in message
news:akf64b$bgc$1 at
> I'm a poor physicist trying to figure out how to sort out the
> "physical" from the "non-physical" solutions to a problem.  To do
> that, I need to be able to look at an expression and pick out a
> subexpression, the part under the radical.

    This points up the need, which I've been aware of for years, to be
able to select any part of an expression and drag it to a new line for
further processing. Mathematica and the other CAS I'm familiar with are still
pretty much stuck with a command line interface. They need a true
GUI with extensive interaction.
    When I can see on the screen exactly what I want to do, why
should I have to type a bunch of stuff in to access what I want?
    Maybe we'll see this in version 5? 6? Never?

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