Am 22.02.2016 um 06:07 schrieb sajeeb Bhm: > check this one! Heh. Nice one. Though. Well. My answer would be: "Associativity for X1 op X2 op ... op Xn where the Xi need not have the same type, for suitably defined op". There. Easy. The task was to "explain", not "apply to a formal system" which would have required formalism.