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NatBin: binary arithmetic for the naturals

examples of arithmetic on the naturals

deleted a reference to "nat", now erroneous because "nat" is a function

many new laws about div and mod

new theorem zless_zero_nat

removal of rewrites for Suc(Suc(Suc...)))

NatBin: binary arithmetic for the naturals

getting rid of qed_goal

getting rid of qed_goal

new division laws taking advantage of (m div 0) = 0 and (m mod 0) = m