Zeros and Poles with respect to stability

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stanford

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I'm trying to grasp the idea of poles and zeroes.

LHP: -20dB/dec
RHP: unstable

for zeros, if they are near the dominant poles, I know it's bad for phase margin but what is the difference between RHZ and LHZ?
 

The location of the zeors on the plane doesn't affect the stability.
 

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