History

Time	Change
2010-10-26 22:53:57+00:00	Associated with idempotent
2010-10-26 22:53:57+00:00	Associated with べき等
2012-02-18 13:03:08+00:00	Associated with 冪等なメソッド
2014-09-04 05:06:13+00:00	Associated with 冪等メソッド