Generalized Intersections of Sets ∩S 些{x VTES.xeT} ∩S(i) def ∩{S()|i∈} iel 50些∩50 i三m ie m,n 8/40 Generalized Intersections of Sets T S def = {x | ∀T ∈ S. x ∈ T} T i∈I S(i) def = T {S(i) | i ∈ I } Tn i=m S(i) def = T i∈[m,n] S(i) 8 / 40