| http://www.w3.org/ns/prov#value | - ostulate 7: if 2 points lie in a plane then the line containing them [also] lies in the plane ??? ??? ??? postulate 8: if two planes intersect, then their intersection is a line ??? ??? ??? postulate 11 1/2: (do not ask me how) through any 3 noncollinear points, there exists exactly one plane ??? ??? ??? addition property if a = b, then a+c = b+c. ??? ??? ??? subtraction property if a = b, then a -
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