  The main purpose of this paper is to introduce a new category, which we call
a resonance category, whose combinatorics reflect that of canonical
stratifications of $n$-fold symmetric smash products. The study of the
stratifications can then be abstracted to the study of functors satisfying
certain sets of axioms, which we name resonance functors.
  One frequently studied stratification is that of the set of all polynomials
of degree $n$, defined by fixing the allowed multiplicities of roots. We apply
our abstract combinatorial framework, in particular, the notion of direct
product of relative resonances, to study the Arnold problem of computing the
algebro-topological invariants of these strata.
