* * * * * Dogs and cats living together I'm watching an animated interview of Buckminster Fuller [1] when I see this sequence of equations: a = b a^2 = ab a^2 - b^2 = ab - b^2 (a+b)(a-b) = b(a-b) a+b = b 2b = b 2 = 1 And I'm thinking, that looks right, as far as I can remember algebra, but two can't be equal to one, can it? I had to work through it by hand to find the problem, and now, gentle reader, you get to work through it yourself. You're welcome. [1] http://www.openculture.com/2015/03/an-animated-buckminster-fuller-tells-studs-terkel-about-the-geodesic-life.html Email Sean Conner at sean@conman.org .