In Section 2.1, there is a typo in the discussion of solving for an exponential input

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Edition Second
Version number 3.0h
Submission date 30 Sep 2016
Your name Chanud Yasanayake
E-mail address
Chapter 2
Page number 2-2
Line number 37
Current status Pending

Ch. 2.1, bottom of page 2-2

It says "We set u(t) = e^st, where s ≠ a_k is a complex number...". Should it be "s ≠ s_k" instead (i.e., s isn't a zero of the characteristic polynomial)?