I Pole Identification Using Block Diagram Reduction

Hraabo
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Hello I hope someone can help me, as i am kinda stuck for the moment.
As you can see, the assignment states that I need to find the poles from the closed loop transfer function.

I plan on doing so, by using block diagram reduction method.

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This is as fare as I've come, and can't come further, even though I am pretty sure that it is possible. The summation point confuses me, how do I remove it? I could remove the feedback loop, but the summation point would still be there, or am I wrong?

Any help would be nice.
 
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@Hraabo,
There is a section here specially for EE. It may be better to post it there.
 
Is that so? Maybe Someone Can Move the post then?

And Sorry for the trouble
 
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No problem, I told a mentor, he should be having a look at it soon.
 
Bump - No help? :S
 
A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.
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