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?
 

Anyone know the difference between RHZ and LHZ?
 

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

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