How to define complex numbers in gams?
You don’t. GAMS and the solvers all work in the real world 
-Michael
Hello Michael, I wish to know if GAMS developed a complex number module.
ChatGPT say that GAMS work with them. 
Best regard,
Andres.
ChatGTP lies which should not comes as a surprise. -Michael
For the information you can trust 100% (unlike ChatGPT), use GAMS documentation : https://www.gams.com/latest/docs/
It doesn’t mention complex numbers anywhere, so they are not supported.
Good luck, Atharv