1、數學家毫不顧及聲明或猜想，他們僅僅根據定義和公理，並用論證和推理來演繹每一件事。事實上，現在把那些僅由猜想或假說建立起來的理論稱之爲科學事不正確的，因爲猜想往往求助於某種見解或主張，因而他不能由此而產生知識。——Reid,Thomas
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