Talk:Test integerness: Difference between revisions

: If you wish to test whether a complex number is an integer you also need to be careful to state what you mean by that term. A complex integer, more usually termed a ''Gaussian integer'' or '''Z'''[''i''], the Gaussian integers is an ordered pair of elements (''re'', ''im'') of '''Z''', the integers. The subset which has ''im'' = 0 is isomorphic to '''Z'''. My ''guess'' is that the latter set is what is meant when the task is extended to treat complex numbers but this should be made explicit.