大家好，我是大老李，今天的节目话题其实是来自“科学有故事”的主播汪诘老师。他最近在着手写一本有关数学的科普读物，他希望我解答一些他在写作中的遇到的难点问题，而我正好也在帮他解答的同时，也把这个解答作为节目介绍给大家。这次他提出的一个问题就是“第二次数学危机”是如何解决的？先解释下什么是第二次数学危机，其实三次数学危机并没有太官方的说法，只是大家都这么说。这第一次就是有关无理数的出现，第二次是微积分的基础危机，具体说就是关于无穷小的，第三次是罗素悖论引发的。这三次危机多少都是与“无穷”这个概念有关的，今天我们着重看看第二次，第二次危机的重点就是关于“无穷小”这个概念订阅“大老李聊数学公众号”
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