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aina.m(b, c)is not equal to theainf(a, b, c). It (solely) determines the implementation ofmthat gets invoked.band/orcget a say in it too.aina.m(b, c), in that it gets single-dispatch automatically without you needing to hand roll anything.a, b, cis still polymorphicf, that accept different types, that calling them witha, b, cwill pick the correct one according to their static types? That's "ad hoc polymorphism". That's not "multiple dynamic dispatch," because it happens at compile-time, based only on static types, without any runtime consideration of the concrete types being used. I was talking about runtime polymoprhism ("subtype polymorphism").