<< "Odd," agreed Reg. "I’ve certainly never come across any irreversible mathematics involving sofas. Could be a new field. Have you spoken to any spatial geometricians?" —Douglas Adams, "Dirk Gently's Holistic Detective Agency" >> When I was a small child, my parents bought a piano, which with a little manoeuvring and a fair amount of muscle was successfully installed in our upstairs flat. The years passed, and when I was a rather larger youth, it was decided that the piano had to go. But on reaching the staircase, the instrument put down its castors and refused to move any further. Dirk Gently being unavailable at the time, my father was finally obliged to demolish the thing in situ with a sledgehammer. WFL On 7/1/18, Bill Gosper <billgosper@gmail.com> wrote:

(I'm sure he knows) can be written Out[436]= 1 + Gudermannian[ArcSinh[1]/3] + 4 Sinh[ArcSinh[1]/3]^2

In[437]:= N[%, 22]

Out[437]= 1.644955218425440851669 https://www.math.ucdavis.edu/~romik/movingsofa/ billgosper$ ries/ries -l7 1.64495521842544085 Segmentation fault: 11 (Can we ever have enough hardware?) --rwg _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com https://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun