I am afraid this is one of the few books I marked in (at least in pencil).
You will want to collect different editions to be sure nothing important has been deleted or replaced.
I have had courses before and after this book, but I keep it because it crosses disciplines, or at least shows practical uses and obscure theoretical uses for math.
It is the sidebar information that keeps you intrigued in the book.
A sample sidebar is:
Breaking codes - finding prime factors of extremely large numbers has been considered a mere computer exercise- interesting for improved methods of working with computers, but of no value in its own right. This has changed in recent years with the new methods of “computer coding,” in which very large numbers are used in an attempt to provide unbreakable codes for computer data. Just as fast as these numbers are used, other people try to find prime factors in them so that the code can be broken.
Then we get how-to examples.
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