There are multiple questions on this site about redefining the real and imaginary part operators. Mine is a bit pedantic. I am quite used to the standard symbols embedded into LaTeX. However for my students, I think it would be clearer to have the second letter appear also, i.e., to have literally Re and Im.
The only problem I have is that I'm very fond of the Fraktur used for the in-build commands, and less so of the ones provided by
Can I get a Re and Im in the same font as the