The amsmath packages helpfully define a macro
\DeclareMathOperator which does what it says on the tin: it declares a mathematical operator such as
\Null or whatever and typesets it all nice and dandy.
If I want to do a one-shot operator, it seems a bit of a fuss to
\DeclareMathOperator it if I'm only going to use it once. So:
Is there a command that typesets its contents in the same way that
\DeclareMathOperator does? (And I'd like it to be exactly how
\DeclareMathOperator does since I sometimes mess with fonts and colours and would like them consistent.)