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  1. How to add and subtract values from an average?

    Feb 16, 2011 · I know that's an old thread but I had the same problem. I want to add a value to an existing average without having to calculate the total sum again. to add a value to an exisitng …

  2. How do you calculate the modulo of a high-raised number?

    I need some help with this problem: $$439^{233} \\mod 713$$ I can't calculate $439^{223}$ since it's a very big number, there must be a way to do this. Thanks.

  3. How to simplify $a^n - b^n$? - Mathematics Stack Exchange

    How to simplify an −bn a n b n? If it would be (a + b)n (a + b) n, then I could use the binomial theorem, but it's a bit different, and I have no idea how to solve it. Thanks in advance.

  4. Perimeter and area of a regular n-gon. - Mathematics Stack Exchange

    Mar 25, 2016 · A friend of mine asked me how to derive the area and perimeter of a regular n n -gon with a radius r r for a design project he is working on. I came up with this, but I want to make sure I …

  5. quadratics - Newton's Identity - Mathematics Stack Exchange

    Jul 10, 2021 · While reading about quadratic equations, I came across Newton's Identity formula which said we can express $\\alpha^n+\\beta^n$ in simpler forms but not given any ...

  6. Maximization with xor operator - Mathematics Stack Exchange

    With given N numbers only one of those numbers doesn't have pair, which one is it? After hours of surfing the net i found that XOR operator is good for that, because X xor X=0 X xor 0=X and A xor ...

  7. Proving that $B(X,Y) $ is a Banach Space if $Y$ is.

    Dec 18, 2018 · Let B(X, Y) B (X, Y) be the family of all bounded maps from X X to Y, Y, normed linear maps. Then, B(X, Y) B (X, Y) is a Banach Space if Y Y is. Remark: I've seen this question before Y Y …

  8. Why do equilateral triangles relate to cubics

    Apr 5, 2023 · I found this question talking about the relation between an equilateral triangle and cubics with three distinct real roots. Here's an image from the original post with an example: What this post s...

  9. elementary number theory - Mathematics Stack Exchange

    Jun 11, 2017 · I'd like to know how to solve these using euclid. I have checked some videos on youtube but I either didn't understand them or it was done without euclid.. If there is exact same question, …

  10. group theory - $a^ma^n=a^ {m+n}$ and $ (a^m)^n=a^ {mn}$ proof ...

    Here is a proof as I allude to in my comments, although this proof depends on having a more rigorous inductive definition of exponentiation as follows: Base case: a0 = Id a 0 = Id, the identity element of …