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The following is definition C.7 from Appendix C (Linear Spaces Review) of Introduction to Laplace Transforms and Fourier Series, Second Edition, by Phil Dyke:

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Shouldn't that be $1 \le i, j \le n$? Is it a typo?

And, of course, the $a_r \not= 0$ should be typeset to $\mathbf{a}_r \not= 0$?

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    $\begingroup$ Sorry, I misunderstand your first point. And it seems that these really are two typos. $\endgroup$ – whereamI Jul 3 '18 at 3:19
  • $\begingroup$ @whereamI That's fine. Thanks for the clarification. $\endgroup$ – The Pointer Jul 3 '18 at 3:20
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Community wiki answer so that the question can be marked as answered:

As has already been clarified in the comments, these are both errors.

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  • $\begingroup$ How do I community wiki answer? $\endgroup$ – The Pointer Jul 3 '18 at 3:28
  • $\begingroup$ @ThePointer: When you answer a question, there's a checkbox labeled "community wiki" near the bottom right of the input text area. $\endgroup$ – joriki Jul 3 '18 at 3:34
  • $\begingroup$ Ahh, ok. Thanks. $\endgroup$ – The Pointer Jul 3 '18 at 3:35
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    $\begingroup$ Sorry, I was referring to my (now-deleted) community wiki answer. I misunderstood what you were requesting. $\endgroup$ – The Pointer Jul 3 '18 at 4:04
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    $\begingroup$ @ThePointer: Ah, a fatal chain of misunderstandings :-) I should have checked the timestamp. So, all cleared up now. $\endgroup$ – joriki Jul 3 '18 at 4:15

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