“Warning: Unfortunately, however, non-PDF versions have also appeared, against my recommendations, and those versions are frankly quite awful. A great deal of expertise and care is necessary to do the job right. If you have been misled into purchasing one of these inferior versions (for example, a Kindle edition), the publishers have told me that they will replace your copy with the PDF edition that I have personally approved. Do not purchase eTAOCP in Kindle format if you expect the mathematics to make sense. (The ePUB format may be just as bad; I really don't want to know, and I am really sorry that it was released.) Please do not tell me about errors that you find in a non-PDF eBook; such mistakes should be reported directly to the publisher.”
