If you're looking for this you probably know what your looking for. It's not a text book...it won't teach you calculus/relativity or solving equations...what it does have is a "gigantic" library of functions/approximations and old school log tables (as well as pages of other tyopes of tables...exp, powers etc...). Graphs, pictures of functions, Reimann functions...the list goes on...<br><br>5 stars seems a bit silly...I wouldnt say "I love it"...but it does what it says and is the one stop shop (I guess) for anything to do with mathematical functions...