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3h
revised Product of “reversed” numbers
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10h
comment Easy to read books on Graph Theory
+1 for Doug West.
14h
answered Modular Arithmetic
17h
comment Prove $\sin^2\theta + \cos^2\theta = 1$
@egreg Er... are you sure? You can prove the subtraction formula from the fact that rotation is linear.
17h
answered How to teach newbie multiply of complex number
17h
comment Proof for A majorizes B
Isn't the definition of majorization that $\alpha$ should be reordered in decreasing order?
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comment Kid's homework: 4 equations 5 unknowns? Going crazy!
@JeskoHüttenhain Have you checked? I'm fairly sure this system of equations is determined. By manipulating the equations we find that each variable can be expressed as an affine function of $e$, including $e$ itself, so we can solve for $e$ and then substitute.
1d
comment Last Two Digits Problem
Here's what happens when you multiply a number by $12$ modulo $100$. The left-most component is a little crowded, but there should be an arrow pointing from each member of the "bouquets" onto the number that's part of the big cycle (eg. 1, 51, and 26 all go to 12). As you can see, 12 is part of a 20 number cycle.
1d
answered Why does this form a basis for $V$? (Intuitive explanations please)
1d
comment How I can express this mathematically?
Why do you think you need to write this more compactly? Your first condition seems clear to me.
1d
comment What is the name of this summation formula?
Not every formula has a name.
1d
revised What is the name of this summation formula?
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1d
revised How to solve this problem? Distributed Game theory?
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1d
comment How exactly does the response “infintely many” answer the question of “how many”?
What exactly do you want to know? Do you not understand how there could be infinitely many solution to a problem?
2d
revised Solving a Linear Non-Homogeneous Recurrence
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2d
answered Material for advanced highschooler
2d
revised Solving a Linear Non-Homogeneous Recurrence
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2d
answered Solving a Linear Non-Homogeneous Recurrence
2d
comment Standard equation of a line
Nobody said that it was the same $d$. Or did they?
2d
comment Solving a Linear Non-Homogeneous Recurrence
I suspect the OP's problem is the $+14400n$ term.