The universal set seemed extremely natural and obvious, yet ultimately several paradoxes of set theory were traced to the assumption that it existed, which mathematicians now know is flawed.
全集看起来非常自然和显然，但是最终集合理论的几个矛盾可以追溯到存在全集这个假设，现在数学家们知道而这个假设是有缺陷的。
The universal set seemed extremely natural and obvious, yet ultimately several paradoxes of set theory were traced to the assumption that it existed, which mathematicians now know is flawed.
全集看起来非常自然和显然，但是最终集合理论的几个矛盾可以追溯到存在全集这个假设，现在数学家们知道而这个假设是有缺陷的。
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