Imaginary number `i`

Question

Is the imaginary number i, defined somewhere in Cadabra?

Answer 1

The version on github now has an ImaginaryI property which is handled automatically,

i::ImaginaryI;
ex:= i i A;

reduces to -A immediately.

Answer 2

There used to be an ImaginaryI property, but I seem to have forgotten to include it in 2.x; thanks for reminding me ;-) Until that's back, simply use

substitute(_, $I I -> -1$, repeat=True);

as a temporary workaround.

Comments

Thank you Kasper! And great job with cadabra2.