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Student Support Forum: '4th Order differential equation yields complex ...' topicStudent Support Forum > General > Archives > "4th Order differential equation yields complex ..."

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Bill Simpson
09/06/12 12:02pm

If I look at

Simplify[dglsolσ1[[1, 1, 2]][x]]

and I assume all your variables are likely Real and positive then there is a single term in your numerator containing -I*expression.

Unless in your maze of radicals and minus signs there are other lurking Complex values, it seems that you need to carefully look at that smaller expression and see whether you can recognize that it is in fact equal to zero. It doesn't appear that Mathematica can recognize that, not at least without additional information, and my attempts to help it with Assuming have failed.

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Subject (listing for '4th Order differential equation yields complex ...')
Author Date Posted
4th Order differential equation yields complex ... Andreas Talmon 09/05/12 08:00am
Re: 4th Order differential equation yields comp... Bill Simpson 09/06/12 12:02pm
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