98 reputation
7
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location Israel
age
visits member for 2 years, 9 months
seen Nov 6 at 10:31

Jul
2
awarded  Curious
Feb
27
awarded  Informed
Oct
10
comment Existence of $k$-regular trees with $n$ vertices
Thanks for your answer. I didn't study Prüfer code, but I did study Cayley's formula, if it has something to do with it.
Oct
10
accepted Existence of $k$-regular trees with $n$ vertices
Oct
10
comment Existence of $k$-regular trees with $n$ vertices
Hi, thanks for your answer. that's look now very simple, I've thinking about this for hours, tried to approach from many ways. And yes, I need to show how to build such a tree but with your help I'll try to do it myself :) Thanks!
Oct
10
revised Existence of $k$-regular trees with $n$ vertices
added 161 characters in body
Oct
10
asked Existence of $k$-regular trees with $n$ vertices
Sep
7
comment In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Thanks for your answer :)
Sep
7
comment In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Alright, that's exactly the solution I've been looking for, and works great.. I always tried to solve it with 2 formulas, and I knew I'm missing something. Thanks!
Sep
7
accepted In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Sep
7
comment In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Seems like you got the right solution, I'll check it in a few minutes, and edit this comment. thanks for your efforts!
Sep
7
comment In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Good idea you got there, but I don't think (actually I'm pretty sure) the solution doesn't involve matrices..we don't use these kind of solutions in my course.. it should be much simpler.
Sep
7
asked In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?
Jun
1
accepted How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
Jun
1
comment How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
Strangely I noticed your addition just now. I really love it, that's the kind of solution I expected! thank you.
May
27
comment How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
It's a good answer, but as far as I know, I'm not allowed to use derivatives at all here. otherwise there are a lot of ways to solve this question, and they are all pretty simple... but thanks though..
May
27
comment How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
That's a lovely answer! it's a bit long, but it does the job. thanks for you efforts!
May
27
comment How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
well, I can't since we did not learn in my class yet. (but I know all about it from another class I'm taking). so it's not allowed in this exercise
May
27
comment How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?
Well, actually, I didn't mention it but i'm not allowed to use L'hopital's rule, since I'm trying to prove the function is not differentiable, and I do this by proving that the limit from both sides does not exists. so it's illegal for me to differentiate the function. I'm trying to prove that using the most basic concepts of differentiation of a function. but maybe I'm going to wrong way here. anyway the function is: $arcsin{\frac{x^2-1}{x^2+1}}$ and I should prove that it's not differentiable at point $x=0$
May
27
asked How do you find the limit of $\lim\limits_{x\rightarrow 0^-}\frac { \arcsin{ \frac {x^2-1}{x^2+1}}-\arcsin{(-1)}}{x}$?