P. 244, line -11
From Bill Goodwine's Wiki
The line should be \int_0^t \Xi^{-1}(\tau)g(\tau) d \tau = \int_0^t \being{bmatrix} -\frac{1}{2} \\ \frac{1}{2} e^{-2 t} \end{\bmatrix} d \tau
The line should be \int_0^t \Xi^{-1}(\tau)g(\tau) d \tau = \int_0^t \being{bmatrix} -\frac{1}{2} \\ \frac{1}{2} e^{-2 t} \end{\bmatrix} d \tau