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May 9, 2018 · 我们可以从数学上证明 1+1=2，但是如何定义 1 是什么。如果说是 0 的后继数，那又如何定义 0 呢？@知乎，中文互联网高质量的问答社区和创作者聚集的原创内容平台，于 2011 年 1 月正式上线，以「让人们更好的分享知识、经验和见解，$Jun 13, 2020 · Is there a formal proof for $(-1) \\times (-1) = 1$? Its a fundamental formula not only in arithmetic but also in the whole of math. Is there a proof for it or is