I would like to define a math operator with
\mathop and I would like its arguments to be automatically put in a zero width box with
\mathclap. Defining an operator, e.g.
would do, but it would force me to provide every time two arguments. If I define the new command with an optional argument, that wouldn't solve the matter, since the mandatory argument is still to be provided (and I may need only the optional in some occurrences). Besides
\mathop doesn't require a specific order of the arguments, while