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From: zuhair on 13 Feb 2010 23:46 On Feb 12, 2:25 am, zuhair <zaljo...(a)gmail.com> wrote: > On Feb 10, 11:31 pm, zuhair <zaljo...(a)gmail.com> wrote: One can actually define a selection trial as a trial to pick up an object. Now the "outcome" of a selection trial is either *failure* if the object is not selected, or it is *the selected object* if selection is made. A collective attempt can be defined as the whole of all selection trials. Now the *Collection status* of a collective attempt can be defined as the Whole of *outcomes* of all selection trials of the collective attempt. So for example the collection status of a collective attempt in which 0 was successfully selected in a theory in which the universe of discourse have only 0 and 1 in it would be : {0, failure} Now membership of a set can be defined in the following manner X e Y if and only if Y is the collection status of the collective attempt in which Y was selected. In this way for example the empty set would be in reality the following {failure, failure, failure,....} but a member of a set is defined to be a *selected object* So that's why the empty set is empty, while at the same time it is a collection status of failures, it is empty because it doesn't have objects successfully selected. I think this terminology clarify matters more. Zuhair |