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6. Product Spaces - Probability

Tutorial 6: Product the following,Iis a non-empty 50 Let( i)i Ibe a family of sets, indexed by a non-empty productof the family( i)i Itheset, denoted i I i, and defined by: i I i ={ :I i I i, (i) i, i I}In other words, i I iis the set of all maps defined onI,withvalues in i I i, such that (i) ifor alli (Axiomofchoice)Let( i)i Ibe a family of sets,indexed by a non-empty , i I iis non-empty, if andonly if iis non-empty for alli finite, this theorem is traditionally derived from other 6: Product Spaces2 Exercise Let be a set and suppose that i= , i Iinstead of i I i.

Tutorial 6: Product Spaces 1 6. Product Spaces In the following, I is a non-empty set. Definition 50 Let (Ω i) i∈I be a family of sets, indexed by a non- empty set I.WecallCartesian product of the family (Ω i) i∈I the set, denoted Π i∈IΩ i, and defined by: i∈I Ω i = {ω: I →∪ i∈IΩ i,ω(i) ∈ Ω i, ∀i ∈ I} In other words, Π i∈IΩ i is the set of all maps ω ...

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