In appropriate conventions one would leave it as because is not seen in a good light as it does not show a sense of completeness but instead lack of desire for completion. To me, this is more of a good habit in mathematics to write it as instead of
In appropriate conventions one would leave it as because is not seen in a good light as it does not show a sense of completeness but instead lack of desire for completion. To me, this is more of a good habit in mathematics to write it as instead of