問羅素誖論

天越~ 去search "Russell Paradox"吧, 會有好多資料的. 你有否學過 set theory? 這問題是關於是否任意一個概念都可得出一個set 詳細的, 你先看一看關於 set 的書才繼續吧

search it for you Some sets, such as the set of all teacups, are not members of themselves. Other sets, such as the set of all non-teacups, are members of themselves. Call the set of all sets that are not members of themselves S. If S is a member of itself, then by definition it must not be a member of itself. Similarly, if S is not a member of itself, then by definition it must be a member of itself. => contradiction