Is this available in an off-line bundle? I am becoming increasing wary of online books&#x2F;training&#x2F;applications that can not be read locally. If I am going to take the time to read through a full book (possibly weeks of reading) I want to be able to use&#x2F;reference it in 5 years like my paper books.<p>most of the value of a good math book is that years after reading it you can use it as a reference to look things up you will inevitably forget.