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- What does $QAQ^{-1}$ actually mean? - Mathematics Stack Exchange
1 $\begingroup$ When one thinks of matrix products like that, it's helpful to remember that matrices, unlike vectors, have two sets of bases: one for the domain and one for the range Thinking of applying a vector on to the right, we get that the transformation "unrotates" the vector, applies the original transformation in the original basis
- Why is $1 i$ equal to $-i$? - Mathematics Stack Exchange
There are multiple ways of writing out a given complex number, or a number in general Usually we reduce things to the "simplest" terms for display -- saying $0$ is a lot cleaner than saying $1-1$ for example
- What is the value of $1^i$? - Mathematics Stack Exchange
There are infinitely many possible values for $1^i$, corresponding to different branches of the complex logarithm The confusing point here is that the formula $1^x = 1$ is not part of the definition of complex exponentiation, although it is an immediate consequence of the definition of natural number exponentiation
- 卡路里、千焦、大卡傻傻分不清楚？关于热量看这一篇就够了
日常摄入热量的单位一般用“卡路里”来计算，简称卡，1千卡=1000卡（也称为1大卡）。 千焦和千卡的换算关系是：1000千焦=238 9大卡，1 大卡（千卡）=4 18千焦（KJ），一般千焦换算成大卡可以直接除以4 18来计算如果要粗略计算热量，直接除以4即可。
- Why is $1^{\\infty}$ considered to be an indeterminate form
The indeterminate forms are often abbreviated with stuff like "$1^\infty$" but that's not what they mean This "$1^\infty$" (in regards to indeterminate forms) actually means: when there is an expression that approaches 1 and then it is raised to the power of an expression that approaches infinity we can't determine what happens in that form
- Why is $1$ not a prime number? - Mathematics Stack Exchange
actually 1 was considered a prime number until the beginning of 20th century Unique factorization was a driving force beneath its changing of status, since it's formulation is quickier if 1 is not considered a prime; but I think that group theory was the other force
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- analysis - Little Small $o(1)$ notation clarification. - Mathematics . . .
$\begingroup$ @chazisop By "mod sign" Matthew means the absolute value signs, and (I mean this neutrally) it's surprising you haven't seen them before, so I suspect you might have misconstrued his intended meaning
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