# Typo in Definition of Orthogonal Set of Vectors?

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:

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 $\mathbf{a}_r \not= 0$?

• Sorry, I misunderstand your first point. And it seems that these really are two typos. – whereamI Jul 3 '18 at 3:19
• @whereamI That's fine. Thanks for the clarification. – The Pointer Jul 3 '18 at 3:20