[OS X TeX] Redefining a math symbol

[Michael Welsh]

On 19/04/2013, at 8:33 AM, J. McKenzie Alexander <jalex at lse.ac.uk> wrote:
> 
> But I was interested in learning whether there was a LaTeX command like \DeclareMathOperator, except for binary relations (and which wasn't restricted to only being used in the preamble). Or maybe a pointer to some source about how LaTeX is told to interpret symbols in math mode… I guess I need to return to the TeXbook.

Is \mathrel{} what you're looking for?

Michael