Solved
Werner_EAnswer
25-Diamond I
Jul 16, 2026 7:52 PM UTC
To get the imaginary unit you have to type 1i (without space, multiplication inbetween)
See the help
Unlike in legacy Mathcad, where this was necessary ,too, in Prime the 1 is always visible:

In legacy Mathcad (here Mathcad 15) the “1” is only visible if the cursor is placed in the region:


