Question: Select an element from a piecewise solution

Hi all!

solve({q[R1] >= 0, q[S] >= 0, `dΠ`[R1] = 0}, q[R1])

This command gives me a piecewise solution, showing somewhat like:

 

[] q[S] < 0.13...

[{q[R1] = ...(q[S])   }] q[S] => 0.13...

 

Is there some way to define that part of this piecewise function for which q[S]=>0.13 as a seperate function? I need to do some more work on q[R1] but somehow I´m not able to isolate this element.

 

Thanks for any help.

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