## Search found 5 matches

Tue Mar 10, 2009 9:01 pm UTC
Forum: Mathematics
Topic: Reciprocal of a derivative
Replies: 7
Views: 2175

### Re: Reciprocal of a derivative

should this work ? Is it okay in a formal context? Why, when and whatfor? If f is invertible on some open set containing x, f is differentiable at x, and f'(x) is nonzero, then f -1 is differentiable at f(x), and \frac{d}{dy} f^{-1}(y)|_{y=f(x)}=\frac{1}{f'(x)}. For the ...
Tue Mar 10, 2009 9:59 am UTC
Forum: Mathematics
Topic: The Fibonacci Sequence
Replies: 14
Views: 3058

### Re: The Fibonacci Sequence

Quotients of succesive Fibonacci numbers give the continued fraction convergents of the golden ratio [imath]\phi = (1 + \sqrt{5}) / 2[/imath].

Also, I rather suspect the editors of Fibonacci Quarterly think the sequence is of some interest.
Tue Mar 10, 2009 9:24 am UTC
Forum: Mathematics
Topic: Math Software
Replies: 143
Views: 164251

If you're a student, I highly recommend the student version of Mathematica . It runs $120 and will carry you from high school through graduate school, should you need it to. If you're not a student, I'm inclined to recommend SymPy or [url=sagemath.org]Sage[/url]. Both are Free Software (as in no cos... Tue Mar 10, 2009 9:20 am UTC Forum: Mathematics Topic: Turning a TI-84 into a TI-89 Replies: 26 Views: 12323 ### Re: Turning a TI-84 into a TI-89 An 89 is not that expensive to begin with. It runs about the same as a college calculus textbook ($150 or so). Incidentally, I took calculus so long ago that to do the things the TI-89 does now, you would have needed a $3000 computer that weighs around 40 pounds, running a$1000 application. Today, ...
Tue Mar 10, 2009 9:09 am UTC
Forum: Mathematics
Topic: Math Books
Replies: 379
Views: 274285

### Re: Math Books

What is the best calculus book that is clear and concise and also easy to self-read/ teach yourself since I heard my school's AP BC Calculus book is miserable. I don't know about "best," but the Schaum's outline series is very cheap (\$10 on Amazon) and easy to read. Gilbert Strang's text ...