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July 1st, 2013, 03:21 AM   #1
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S-lemma

Hi everyone,

I've joined this forum because of a exercise that is bugging me. I study control-theory, and the following question is in one of the exercises:


I've tried to reason it through, to find some situation in which the extra condition is needed, but for every situation it seems the condition will hold anyway...

Can somebody help me with this? I am not asking for the right answer, but just for some indication in which direction I should look.

Thank you in advance!
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July 1st, 2013, 03:27 AM   #2
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Re: S-lemma

Sorry for the error in the previous post. Here is the lemma:

[attachment=0:69ff37x8]snip.PNG[/attachment:69ff37x8]

The question is to find an example which explains the need of the extra condition on for the first to imply the second.
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