A scientist never presupposes the truth of an unproved fact.
科家从不预先定未经证。
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After once admitting that a straight line was the shortest distance between two points, no serious mathematician cared to deny anything that suited his convenience, and rejected no symbol, unproved or unproveable, that helped him to accomplish work.
在承认直线是两点之间最短距离之后,没有一个严肃数学家愿意否认任何适合他方便,并且拒绝任何符号,无论是未经明还是不可明,都有助于他完成工作。