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- What does $QAQ^{-1}$ actually mean? - Mathematics Stack Exchange
I'm self-learning Linear Algebra and have been trying to take a geometric approach to understand what matrices mean visually I've noticed this matrix product pop up repeatedly and can't seem to de
- Why is $1 i$ equal to $-i$? - Mathematics Stack Exchange
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- How can 1+1=3 be possible? - Mathematics Stack Exchange
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- 总是听说降雨量多少毫米这样，那想请问一下降雨量1毫米是什么概念？ - 知乎
实际上，天气预报中所说的雨量跟公众了解的积水深度并不能完全等同。 气象上一般把连续24小时，降水量50毫米以上的雨叫暴雨。 我们先以1毫米降水为例，看看小雨的威力。 首先，1毫米雨，看上去微乎其微，但如果降雨的范围（面积）很大，雨量也很可观。
- what is 1 - 1 2 + 1 3 - 1 4 + 1 5 - 1 6 + 1 7 - 1 8 +1 9
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