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Talk:Greatest common divisor: Difference between revisions
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The special case of '''gcd(0,0)''' is usually defined to be '''0''', but some authors consider it to be '''undefined'''. When implementing the REXX version 1 example, the first definition (equal to zero) was chosen. So, for that case, '''
From the Wikipedia page: http://en.wikipedia.org/wiki/Greatest_common_divisor
It is useful to define '''gcd(0,0) = 0''' and '''lcm(0,0) = 0''' because then the natural numbers become a complete distributive lattice with '''gcd''' as the ''meet'' operation, and '''lcm''' as the ''join'' operation.
-- [[User:Gerard Schildberger|Gerard Schildberger]] 16:10, 17 August 2012 (UTC)
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