Contact Us
Problems, bugs and technical queries
Please check the FAQs and errata pages first in case your problem or query has already been dealt with.
Please also take the time to report any problems you have using this website. It is close to impossible to ensure that a site works tidily with every existing browser but we do our best and much prefer you told us about problems than just went away.
Praise and suggestions
We love praise so please be generous with giving it. If you have something wonderful to say about the book (or website) please tell us. We welcome suggestions too.
Programs, New Exercises and Art Gallery Contributions
If you have a program, a new exercise or a picture for the Art Gallery please send the material to Francis at the email address given below. Please do not send either an actual picture or an executable (because of viruses, Trojans etc. Francis refuses to even open such files).
Because I (Francis) hate spam I avoid providing a contact address in any form that can be harvested by those who are intent on destroying the Internet as a tool for communication. To contact me send an email to the address you get by replacing the 'junk' with ycdi in junk@robinton.demon.co.uk. Note that if this email (ycdi) address starts to get much spam it will be changed so if you do not get a reply check here for the latest contact address.
I also publish a specific codeword that when included in the subject of an email ensures that it will be accepted even if the source is otherwise black-listed by me. For obvious reasons this word changes periodically. Currently all emails with 'syzygy' in the subject are accepted. Note that emails sent by using the form below will always be accepted, the codeword is only for those emailing me with their normal mailer and ensures that mail from an unexpected source will not be ignored sight unseen.
You can use the following form to send simple text messages. If you do not complete the email address item correctly you will not get a response because we will not know where to send it.