零的概念不止於“無”和“空”。零的概念是與負數的概念相伴相生。先秦時代沒有負數的概念，就沒有零的概念

來源: viBravo5 於 2023-08-28 21:06:15 [舊帖] [給我悄悄話] 本文已被閱讀：次

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