1.獨角獸是白色的 2.白色必然存在 3.獨角獸存在。在1裏寫出獨角獸時，其實在謂詞邏輯裏已經是假設獨角獸存在了。

來源: 露重煙微於 2024-03-26 22:13:00 [舊帖] [給我悄悄話] 本文已被閱讀：次

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