Do you have any questions or comments about the book? Any doubts that you couldn’t solve after trying hard, very hard?
Then you might better call Luis!
Here is how to proceed:
(1) First, make an effort to clarify your question as succinctly as possible.
(2) Write your question clearly referencing the section of the book or exercise that you are following.
(3) Send an email to Luis (check here for the address) with your question or comments with the subject “Questions for Luis – www.introductiontographene.org” .I receive many requests and cannot warrant an answer but I promise that I’ll do my best to provide a prompt feedback!