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App developer, Research Associate, and Lecturer of and dabbler in Mathematics.


Sep
9
comment Proving $\arg(zw)=\arg(z)+\arg(w)$
The principal argument is a well known concept. What do you mean by the usual sum?
Sep
9
revised Proving $\arg(zw)=\arg(z)+\arg(w)$
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Sep
9
comment Proving $\arg(zw)=\arg(z)+\arg(w)$
In that case, $\text{Arg}(-i)=3\pi/2$, and so $\text{Arg}(-i)+\text{Arg}(-i)=3\pi\equiv \pi$. But $\text{Arg}(-i\times-i)=\text{Arg}(-1)=\pi$. This is correct given arguments in $[0,2\pi)$.
Sep
9
comment Proving $\arg(zw)=\arg(z)+\arg(w)$
I think that fixes it, but I'm sure you will throw another spanner my way @ Did.
Sep
9
revised Proving $\arg(zw)=\arg(z)+\arg(w)$
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Sep
9
revised Proving $\arg(zw)=\arg(z)+\arg(w)$
[Edit removed during grace period]
Sep
9
answered Proving $\arg(zw)=\arg(z)+\arg(w)$
Sep
9
comment Find the generating function of the sequence $a_n = \sum\limits_{k=0}^n k(k-1)$
For reference, the answer is $$\frac{2 x^2}{(x-1)^4}.$$
Sep
8
answered Inequalities with logarithms and limits
Sep
8
comment How do I solve the following math problem?
You could start by drawing some pictures to begin to understand the problem.
Sep
8
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
8
accepted Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
Sep
8
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
comment Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
@ Claude thank you for that tip - so it does! - I'll take a look at this.
Sep
7
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
revised Is anything known about $2\pi$ integer multiple arguments of the cosine integral?
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Sep
7
asked Is anything known about $2\pi$ integer multiple arguments of the cosine integral?