a.index(float('nan')) fails

[Thomas Rachel]

Am 27.10.2012 06:48 schrieb Dennis Lee Bieber:

> 	I don't know about the more modern calculators, but at least up
> through my HP-41CX, HP calculators didn't do (binary) "floating
> point"... They did a form of BCD with a fixed number of significant
> /decimal/ digits

Then, what about sqrt(x)**2 or arcsin(sin(x))? Did that always return 
the original x?

Thomas