可定义数：修订间差异

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 == 参考文献 ==
-* {{Cite web | url = http://www.guokr.com/article/11964/ | title = 比根号2更“无理”的数 | author = matrix67 | access-date = 2013-11-04 | archive-date = 2019-06-05 | archive-url = https://web.archive.org/web/20190605160428/https://www.guokr.com/article/11964/ | dead-url = no }}
+* {{Cite web | url = http://www.guokr.com/article/11964/ | title = 比根号2更“无理”的数 | author = matrix67 | access-date = 2013-11-04 | | | }}
 [[Category:抽象代数]]