# In Example 13.6 (Vinnicombe metric), the formula for conjugate point is missing a minus sign

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 Edition Second 3.0j 19 Aug 2019 Richard Murray murray@cds.caltech.edu 13 13-8 -9 Closed

The formula for the conjugate points should be $1 + P_1(i\omega) P_2(-i\omega)$ = 0 (the argument to $P_2$ is missing a minus sign). .