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

{{Errata
|Book edition=Second
|Version number=3.0h
|Submission date=30 Sep 2016
|Your name=Chanud Yasanayake
|E-mail address=cyasanay@caltech.edu
|Chapter number=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)?