For fireworks permutations, the support of a Grothendieck polynomial is exactly the union, over Schubert monomials, of the componentwise intervals up to the top weight vector.
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Newton polytopes of fireworks Grothendieck polynomials
For fireworks permutations, the support of a Grothendieck polynomial is exactly the union, over Schubert monomials, of the componentwise intervals up to the top weight vector.