Question

You have found that some of the answers provided in your book on Mathematics are wrong Write an email to the publisher.​

Answer 1

Answer:

This is an interesting question. In your case, I'd actually contact the corresponding author. They are responsible for their work and should revise or restate erroneous parts in it.

I would not make it public (by writing another article, for example), before you have given them a chance to correct mistakes by themselves. Only if they have not been responsive within a period of time, you might write to the editor or publish a response in the same journal. You should consider, though, that you may not make many friends by publishing anti-articles about minor errors. And, in the end it might turn out that your view on the publication is not correct.