Math Is Fun Forum

There is a place where you can contribute articles to MIF.

Speaking of, I wonder if MIF ever got my submissions...

Great page, albeit a bit too oversimplified (in my opinion) but good for introductory purposes.

In the US we call that cheating.

T&E, I hope.

I think I am going blind.

Yes, but only because I have used it in certain problems. Not every one encounters the same problems.

This works for the general form of a quadratic equation (i.e. ax^2 + bx + cy^2 + dy + exy + f > 0).

It works only for the roots of the equation.

If you mean all the values of the quadratic equation, you would need to read about linear algebra, Sylvester's criterion etc.

I can't believe my success in this nowadays. Top 50 on SPOJ too!

To be honest, you need none. Know what it means by multiplication and you should be able to do it easily. If you want a number, do it until 12. I don't really know beyond that either, but I can calculate the multiplication of three-digit numbers in a couple of seconds. Is it because I memorized it? No.

As much as you want.

Doesn't really matter.

You need to memorize all the axioms including those, but they are obvious enough especially with intuition. What is the cumulative law?

Well, you need to know what the words mean but you don't have to memorize definitions verbatim.

Learn how to prove instead.

Learn the common ones, derive the others.