Handle lcm(0,0) #3
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Wikipedia (https://en.wikipedia.org/wiki/Least_common_multiple) suggests: > Since division of integers by zero is undefined, this definition has meaning > only if a and b are both different from zero. However, some authors define > lcm(a,0) as 0 for all a, which is the result of taking the lcm to be the least > upper bound in the lattice of divisibility.
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Wikipedia (https://en.wikipedia.org/wiki/Least_common_multiple) suggests: