Hello,
Maybe I'm wrong, but I don't understand the last 0.
Test :
var('m') ; y=sqrt(m^2-1)
y(m=0) # =I, is right
imag(y) # =.... feels right, arctan2(0,-1)=pi when m=0
imag(y(m=0)) # =1, is right
(imag(y))(m=0) # is 0 and I don't understand why !
Francois in France.
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