complex, real, common ring, crash in 'vector' constructor
(x,y,z) = var('x,y,z') x = z.real_part() y = z.imag_part() test = vector((x,1,1)) test = vector((x,y,1)) test = vector((z.real_part,1,1))
Last line causes an error, can't find common ring for all elements.
These variables all have type "Expression"; but some expressions denote complex numbers and some denote real numbers. How do I tell sage about that? (Sage 6.5 on Mac OS 10).