安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Mathematics Stack Exchange
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- Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange
In my work "=" is the identity of a number so it states an equivalence 1=1, 2x=10 ie x =5 The approximation sign "≈" I use for decimal approximations with tilde "~" being a rougher approximation
- factorial - Why does 0! = 1? - Mathematics Stack Exchange
$\begingroup$ The theorem that $\binom{n}{k} = \frac{n!}{k!(n-k)!}$ already assumes $0!$ is defined to be $1$ $ Otherwise this would be restricted to $0 <k
- Good book for self study of a First Course in Real Analysis
For self-study, I'm a big fan of Strichartz's book "The way of analysis" It's much less austere than most books, though some people think that it is a bit too discursive
- Use of and and or in Union and intersection of sets.
Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
- Pole-zero cancelation method for PI controller design
I think it is ill-advised in practice to do pole-zero cancellation Unstable pole-zero cancellation is just plain bad (the closed loop will be unstable) but stable pole-zero cancellation is also not great for practical reasons
- matrices - How to multiply a 3x3 matrix with a 1x3 matrix . . .
Suppose you have two matrices A and B Let A be a 3x3 matrix and B be a 1x3 matrix As stated above, you can only multiply matrix C (mxn) by matrix D (pxq) if n=p
- Prove that $1^3 + 2^3 + . . . + n^3 = (1+ 2 + . . . + n)^2$
Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
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