Benedicks's theorem Amrein–Berthier and Benedicks's theorem intuitively says that the set of points where is non-zero and the set of points where is non-zero cannot both be small.
benedicks's Theorem amrein–BErTHIEr AnD BeNedickS'S TheOrEM iNtuitIveLy sAYs ThAt The sEt of points whEre is nOn-Zero aNd The seT Of PoinTs wHeRE Is non-zero CanNOt both be small.