This isn't a homework question; I'm sorry if I'm mis-posting, but I thought someone here could help. See this link: http://books.google.com/books?id=1Q...=intro+complex+analysis&lr=&as_brr=3#PPA56,M1 On page 56, does this book have a misprint in the definition of a differentiable complex function? On 5.1? Shouldn't the bottom of the quotient be 'h' instead of 'z'? I'm probably misreading or something. But I'm confused at why h is at the bottom of the quotient further down the page. I don't know, maybe I'm being silly and there's something right there that I'm missing? Please help me out, thanks!