Appendix B
Solutions to Problems
Problem 1.1.2 The set 
is not a number system since 1, 3 ∈ 
but 1 + 3 = 4 ∉ 
.
The set 
is a number system. The elements of 
are of the form 2n where n ∈ . Let m, n ∈ . Then m + n ∈ so that 2 m + 2n = 2(m + n) ∈ , and ...
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