21. These maps are bijective up to a countable null set ( due to the double representation of some rationals ). 22. You can also drop the pointless showing off of invoking the " null set " and simply say " none ". 23. Boolos was interested in GST only as a fragment of Specification, and with the existence of a null set explicitly assumed. 24. Any non-complete measure can be completed to form a complete measure by asserting that subsets of null sets have measure zero. 25. The measurable sets on the line are iterated countable unions and intersections of intervals ( called Borel sets ) plus-minus null sets . 26. In a null set is the set with zero elements; and in measure theory, a null set is a set with zero measure. 27. In a null set is the set with zero elements; and in measure theory, a null set is a set with zero measure. 28. The notion of null set in set theory anticipates the development of Lebesgue measure since a null set necessarily has "'measure zero " '. 29. Null by itself is used in things like null set and aleph null .-- talk ) 22 : 32, 27 August 2008 ( UTC) 30. The notion of null set in set theory anticipates the development of Lebesgue measure since a null set necessarily has "'measure zero " '.
