• 1. Symmetric Strict Monoidality With Respect to Intersections. The direct image function of Item 1 has a symmetric strict monoidal structure
    (R!,R!,R!|1):(P(A),,A)(P(B),,B),

    being equipped with equalities

    R!|U,V:R!(UV)=R!(U)R!(V),R!|1:R!(A)=B,

    natural in U,VP(A).


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