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visits member for 3 years, 10 months
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Aug
21
comment How did the notation “ln” for “log base e” become so pervasive?
This is exactly how we were teached in high scool.
May
7
comment Expression for function's period
I meant analytic functions.
May
7
comment Expression for function's period
Yes. I want a constructive formula that gives an actual expression or encodes an algorithm of how to find such period.
May
7
comment Expression for function's period
I am interested in operator that returns (minimal) period for analytic functions.
Apr
30
comment Reverse search for rational function
Well I meant can there be such function of u and v that gives the polynomial's coefficients irrespective of the method of how u and v are given.
Apr
30
comment Reverse search for rational function
If we find at leat one pair of polynomials we can cancel the common factors out of course so the task is ti find at least one such pair or the function Q directly.
Apr
30
comment Reverse search for rational function
Yes, of course. I meant the simplest form of that function.
Apr
10
comment Tractrix-like curves
Interesting, is it possible to have an explicit expression for alpha?
Apr
10
comment Tractrix-like curves
Oh now I see the result of the expression should be the $(x,y)^T$ vector. It is just omitted but there should be an equality sign.
Apr
10
comment Tractrix-like curves
Thanks but still cannot understand how an equatioc can be without equality...
Apr
10
comment Tractrix-like curves
Ok, alpha is the vector? But where is the equation? I see no equality sign...
Apr
10
comment Please suggest a sequence with the following properties
$\sum_{n=0}^{\infty} \frac1{n!}$ will converge to e (it is exp(1)), and it is a trivial case to take $a_n=\frac1{e n!}$
Apr
10
comment Tractrix-like curves
You said there is a parametric equation, but there is no equation sign in it.
Apr
10
comment Tractrix-like curves
I do not see x and y, only f, g and alpha and there is no equation....
Apr
7
comment Tractrix-like curves
It should be equal to zero?
Mar
22
comment How to express in closed form?
Thank you. It seems this expression can be expressed without Im and Re.
Mar
22
comment How to express in closed form?
Is the sgn(iz), i.e of an imaginable value defined somehow?
Mar
22
comment How to express in closed form?
Yes, I want a one-line formula.
Feb
20
comment What's the thing with $\sqrt{-1} = i$
They teach just the same way in Russia BTW so what's the point?
Feb
7
comment Rotation around a vector with complex coordinates
Yes, I just guess what would happen if we change to $\mathbb{C}^3$