Talk:Cofinal (mathematics)

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[edit] Cofinal set of subsets

Is the set inclusion the right way round in the last substantive section? Isn't it supposed to read a is contained in b? That would make sense to me. Francis Davey 09:42, 9 August 2006 (UTC)

That would depend on the way the order relation on A ⊂ P(E) is defined: Given a,b ∈ A, a ≤ b could be defined as a ⊂ b or dually as b ⊂ a. I think this should be made clearer in the article. —Tobias Bergemann 10:34, 9 August 2006 (UTC)

Right, so the confusing thing is the reference to being ordered by inclusion - the question being which direction. Francis Davey 19:30, 9 August 2006 (UTC)