How does one generate custom symbols? For example, the physicist notation for the rotation is "nabla cross function". In this case however, Mathematica complains that the
[esc]del[esc] symbol evaluates to the unary operator
Del, which of course cannot take a cross (
[esc]*[esc]) after it, since a bracket is expected.
Although a correctly looking output is generated by
the result cannot simply be assigned to an operation (
Prefix[...] := ...) you can type in using the nicely readable [esc] commands I mentioned above. Is there some way of doing this, i.e. invoking completely custom functionality to (combinations of) existing symbols?