In: Statistics and Probability
5. Let n = 60, not a product of distinct prime numbers.
Let Bn= the set of all positive
divisors of n. Define addition and multiplication to be lcm and gcd
as well. Now show
that Bn cannot consist of a Boolean algebra under those two
operators.
Hint: Find the 0 and 1 elements first. Now find an element of Bn
whose complement
cannot be found to satisfy both equalities, no matter how we define
the complement
operator.