Anyone know a really good mathematical website?

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I'm looking for an extremely comprehensive math website (preferably one I don't have to pay for). Algebra, trigonomety, calculus, whatever! Or am I better off just buying a few college textbooks on Amazon? I've always wanted to be good at math, so I figured I'd get going.

http://mathworld.wolfram.com/


http://mathforum.org/dr.math/

You might also be interested in logic. Along with math, it is part of the formal sciences. Personally, I'm becoming more interested in statistics. The real reason I liked math and logic was because I thought I could use it to understand the world around me, which they do.

Statistics, though, seems more applied and relevant. It requires knowledge in at least algebra. Calculus is needed for more advanced stuff. Apparently, no fancy logic is needed.

abstrusemortal, thanks for the math website link -- that could come in handy for my kids!

Kris

Oh wow, thanks! Those are good sites! Better than I expected

This one is one of my favorites:

http://tutorial.math.lamar.edu/

http://www.math.ucdavis.edu/~kouba/ProblemsList.html << for calculus practice problems (with full solutions to them); briefly overviews a topic before listing the problems for it

I have found the site Angelus-Mortis gave the link to be useful.

This one may be useful too. It's in my bookmarks, but I have not used it much: http://web.mit.edu/wwmath/calculus/ispath/ispath.html

Lately, I have been relying on books from the library and books that I have purchased--that's more convenient to me for some reason. No peering at the computer screen or worrying about bugs in the browser. Also, the books tend to have more polish.

If you decide to go the route of purchasing some books, I recommend The Calculus Lifesaver, by Adrian Banner, and a workbook of a lot of solved calculus problems. (For example, 1001 Solved Calculus Problems.)

These sites are references to sequences and algorithms:
http://en.wikipedia.org/wiki/On-Line_En ... _Sequences
http://www.research.att.com/~njas/sequences/Seis.html Goes with the wiki link above.
http://www.alpertron.com.ar/ECM.HTM A site for factoring large numbers.
I found these useful when I was going through my prime number thing....
Here's another site that specializes in prime curios:
http://primes.utm.edu/curios/

If you would like something useful for actually doing maths, you might find http://maxima.sourceforge.net helpful.

I used to use a student and then a professional version of Mathematica for Windows for electronics calculations, and graphics
back in the early nineties. I didn't think any of these older symbolic algebra programs such as Derive and Reduce were around anymore. I know Wolfram's product is still around but it is too costly and probably overdeveloped for my needs.

Maxima is quite handy...

Same link I was going to post. Wolfram's the best math site on the net.

If chaos and fractals are what you are into
you might want to check out this site:
http://hypertextbook.com/chaos/

This is the only way I passed anything in maths at school after I was about 16 and my maths ability somehow switched itself off...

http://www.vedicmaths.org

A different way of doing things, using logic, words, patterns, and different parts of the brain than you'd usually associate with maths.

Multiply in the millions, in your mind, in about 20 seconds - no joke!!

Is this any more than some arithmetic tricks and a bit of trivial geometry?
The only link that seemed to refer to anything beyond that gave me an "internal server error".
This link was associated with:

I have no idea what the first on the above list (an "Elementary approach to Goldbach's conjecture") might be. The conjecture is that every even integer greater than two can be written as the sum of two primes. Other than knowing what a prime is, I can't see anything more elementary. The conjecture is currently unproven. Quite where the title of the book ("Goldbach Theorem") comes from, I have no idea.
The second on the list above seems to be a string of buzz words.
The third? What has a slide rule got to do with it? T. Oliveira e Silva is running a distributed computer search that has verified the conjecture up to n <= 10^18 (as of April 2007). (Wikipedia)
The final bit seems like a total waffle pseudo-equation. I have no idea why I should be interested in "sqrt(E)/4".

Yup! Promise. It's the only way I passed anything in my last year in high school; absolutely brilliant. You can apply it to more or less any mathematical equation (I haven't tried any uni-level calc or stats or anything with it, but it works with everything else so I'm sure it's possible to do it... they say it is, but unfortunately I'm not particularly skilled in the maths area so maybe someone else can have a look?!)

That website is a bit screwy at the moment, I'm not sure why.

This link is working though - it's a basic introduction to the principles of it, with working examples etc.

http://www.vedicmaths.org/Introduction/ ... torial.asp

Try that.