The smash sum is the unique sum of open sets satisfying a natural list of axioms
摘要
A sum of open sets is a map taking two bounded open sets A, B and producing a new open set A ⊕ B. We prove that, up to sets of measure zero, there is only one such sum satisfying a natural list of axioms. It is the scaling limit of the Diaconis–Fulton smash sum.