Math Forum / Mathematics / General Topics / March 2008

I have a little problem and I hope somebody can put some light on it.
I also hope this is the correct group to ask as I did not find a
geometry group.
Suppose there is a big rectangle, 'A', and suppose that I put several

any comment on this:
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The parametric equations traces out a loop
x = 5 - (3/2)t^2
y = -(1/2)t^3 + 3t +2
What are the values of t at which the curve intersects itself?

I hope this isn't too trivial to ask but, I'm working through a proof
that appears to rely on the distributive property of polynomials, i.e.
                                  (f + g)(x) = f(x) + g(x)
without saying saying so. I've googled a bit, and I've found that

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Hello, and I could use some help from you tensor folks on the definition
of "outer product".  Is the outer product of two vectors A & B given by
just the AB tensor product or is it AB - BA which would result in a
bivector?  Online and textbook references don't seem to agree when

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How can I get this equality:
Arctan (1) = arctan (1 / 2) + arctan (1 / 5) + arctan (1 / 8)?
Thanks
L-S

Haven't seen him around very much, lately.

My son has science fair coming up and I would love to help him out. Does anyone have suggestions for a math based project?
Thank you,
Bhadresh Gohil

Hi all! I've got this problem in my set:
'1 + 2q + 3q^2 + ... + nq^(n-1) = [1 - (n+1)q^n + nq^(n-1)]/[(1 -
q)^2], q <> 1.
Estabilish [the formula above] by differentiating the expansion of the

Consider a keno game where 20 numbers are drawn out of 80 and we are playing
a one-spot game to try and hit one number. Now 20 numbers drawn out of 80 is
1 in 4 and sure enough just about every state keno game in the country says
that the probability is 1 in 4.

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