For me, digital is absolutely necessary for any technical or academic book. I have to be able to search in it. However, I am not a fan of PDF because it is very

For me, digital is absolutely necessary for any technical or academic book. I have to be able to search in it. However, I am not a fan of PDF because it is very inflexible in its presentation, and it is hard to transform into other formats. I prefer a web document or even just plain text.