2 Aug
2015
2 Aug
'15
9:51 a.m.
Neat! You got that somehow from In[407]:= Simplify[(2 t/(1 + t^2))^2 + ((1 - t^2)/(1 + t^2))^2] Out[407]= 1 ? --rwg On 2015-08-02 05:56, Warut Roonguthai wrote:
I didn't follow math-fun for a long time (i.e., don't know where this equation came from), but the new subject caught my eye.
Using an elementary method, I found that -8 + 36*a - 27*a^2 is a rational square iff
a = 2/3 + (4/3)*k/(k^2+3) for some rational k.
On Sat, Aug 1, 2015 at 11:53 PM, Bill Gosper <billgosper@gmail.com> wrote:
The data are intriguing. Something about 3 and powers of primes 1 mod 6. What subject is this? BQFs? --rwg