# Errata: A21 entry for op amp dynamics should have a negative sign

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Location: page 92, line 4

The lower left entry to the dynamics matrix (A_21) should be negative, as this is an inverting amplifier, for which v_o=-R_b/R_a v_2. So the entry should be

-\frac{R_b}{R_a} \frac{1}{R_2 C_2}

(Contributed by E. August, 20 Sep 2019)