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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
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- Mathematics Stack Exchange
Q A for people studying math at any level and professionals in related fields
- 1 8, 1 4, 1 2, 3 4,7 8英寸分别是多少厘米? - 知乎
把1英寸分成8等分: 1 8 1 4 3 8 1 2 5 8 3 4 7 8 英寸。 This is an arithmetic sequence since there is a common difference between each term In this case, adding 18 to the previous term in the sequence gives the next term In other words, an=a1+d (n−1) Arithmetic Sequence: d=1 8
- abstract algebra - Prove that 1+1=2 - Mathematics Stack Exchange
Possible Duplicate: How do I convince someone that $1+1=2$ may not necessarily be true? I once read that some mathematicians provided a very length proof of $1+1=2$ Can you think of some way to
- 空调一级能效和三级能效开10小时，能差多少电费？ - 知乎
空调制冷+制热全年耗电量相差794-636=158度电 总结 海尔1 5匹空调，一级比三级年省电159度电 格力1 5匹空调，一级比三级年省电158度电 购买建议：空调使用寿命基本在5~10年，如果你在北方，空调使用少，每年只在夏季开2~3个月空调，这期间总耗电量大约相差1000度。
- 1加十三手机（一加13）怎么样？体验3天优缺点测评
二：一加13（1加十三手机）优点 强大的性能配置：搭载了骁龙8至尊版移动平台，这是高通最新一代的旗舰级处理器，采用台积电第二代3nm工艺制程，CPU则采用了高通自研Oryon架构，拥有2个超大核和6个大核，双超大核频率高达4 32GHz，性能表现卓越。
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