Possible Typo on Gradient of Expectation Proof from Appendix

[prokorpio]

On page 241, shouldn't $a$ from $f(x,a)$ be $\beta$?

Btw, thank you for your work. I'm learning a lot from this book!

[MathFoundationRL]

You are right. a should be beta. Thanks for your careful reading and I'm glad the book helps.