Might one of the following examples work?
The Riemann hypothesis asserts that the real part of every non-trivial zero of the Riemann zeta function is equal to .
(Stealing from Wikipedia): A sequence of groups and group homomorphisms is called exact if for .
(Also paraphrased from Wikipedia): Given an matrix whose elements are , we can define the determinant where is the symmetric group on elements.
I'm a bit worried, though, that "standard research notation" in one discipline is foreign to mathematicians in other disciplines.