Random walk

In the situation you're reading an electronic book (PDF, DejaVu, etc), it is rather often the case to have a shift between the PDF page numbering and the book numbering. In this case, a very simple relation allows you to connect the PDF page number to the book page number.

• Let $a$ be the book page number you want to reach.
• Let $b$ be the PDF page you reach by typing $a$ into the page field of the reader.
• Then just go to page \[ c=2b-a \]. Here you are.