| http://www.w3.org/ns/prov#value | - removable but their union is not.There is a necessary condition for a set to be removable, and that condition is that its compliment in the set of all lines be infinite.Any such co-infinite set of lies may be removes from the set of all lines without diminishing the union of the set of lines remaining to less than the set of all naturals.But removing any co-finite set leaves a finite set of li
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