Complex arithmetic

• re: real part
• im: imaginary part
• conj: conjugate
• abs: absolute value (modulus)
• arg: argument. Warning: for expressions containing variables, the returned argument is only valid modulo $\pi$.

Remark 6   If flag 13 is cleared (real mode), all global names and all non rational functions are considered as real w.r.t. the instructions RE, IM, CONJ. This could lead to false simplifications if a global name stays for a complex, or if a non-rational inverse function is called with a usually forbidden real argument, like LN(-1) or ASIN(2)

Solution: either replace your global name, say 'Z', by 'X+iY' or set flag 13 (shortcut $\alpha$-right shift-CST or 13 SF)