Jan
4
answered Procedure for showing a polynomial is irreducible in $\mathbb{Q[x]}$
Dec
29
comment Linear Dependence Of A Sum
@Henning Makholm: Thanks, done
Dec
27
revised Factorize the polynomial $x^3+y^3+z^3-3xyz$
some exponents were wrong
Dec
27
comment Linear Dependence Of A Sum
i noticed that i have downvoted this by accident about an hour ago. It is not possible to undo this downvote now. sorry.
Dec
19
answered Find maxi,minimum $f(x,y)=x^3+y^3 (\text{where} ~~~ x,y\in \mathbb{R}, x^2+y^2=1)$
Dec
19
comment Simplifying an equation
I think the correct notation is $$\frac{du}{dt}=2t$$ and so on which is generated by $$\frac{du}{dt}=2t$$.
Dec
18
revised Simplifying an equation
tex formating
Dec
18
suggested suggested edit on Simplifying an equation
Dec
17
revised Algebra of the complex plane
deleted 56 characters in body
Dec
17
answered Algebra of the complex plane
Dec
12
comment Counterexample to Eisenstein criterion
@Git Gud: This question makes sense. if one removes condition "$p$ is prime" by "$p$ is an arbitrary integer" then the statement is wrong.
Dec
8
revised What is the opposite of this condition?
reformatting equations and changing symbols
Dec
7
answered What is the opposite of this condition?
Dec
5
comment Is $x^4+x+1$ irreducible in $\Bbb{Q}[x]$?
$f(5)=631$ is a prime so f(x) is irreducible. See math.stackexchange.com/questions/568094/…
Dec
5
comment Is $x^4+x+1$ irreducible in $\Bbb{Q}[x]$?
you should do this $\pmod 2$. Otherwise you have to investigate $(x^2+ax \pm 1)(x^2+bx \pm 1)$
Dec
5
comment How to find the minimum of $a+b+\sqrt{a^2+b^2}$
I think the angle at $0$ is $90^\circ$ and $Q$ is the intersection of that angle bisection in $0$ and a normal to $AB$ in $P$. But $|OE|+|OF|+|EF|=|OA|+|OB|+AB|$ is still unclear to me.
Dec
5
comment How to find the minimum of $a+b+\sqrt{a^2+b^2}$
I agree that the problem is: find a triangle with vertices $0,A,B$ such that $A \in y^+$, $B \in x^+$, $P(1,2) \in \overline{AB}$ and the circumference is minimal. But I do not understand the second picture: why is the angle at $0$ not $90^\circ$, how do you get the center $Q$ of the circle and why is $|OE|+|OF|+|EF|=|OA|+|OB|+AB|$
Nov
27
comment Can you construct a field with 6 elements?
yes, you are right. I did not see that they are the same group.
Nov
26
comment Can you construct a field with 6 elements?
Why is $\mathbb{Z}_6$ the only abelian group of order 6? What is with $\mathbb{Z}_2 \times \mathbb{Z}_3$. It is abelian but acyclic. Maybe there are other abelian groups of order $6$? There are no such groups but how to proof this? Your argument does not work if the order of $1$ is not $6$, so if the goup is not cyclic. Please add "@miracle173" to a response otherwise I will not get a notification.
Nov
26
comment $3+33+\dots+33\ldots3={10^{n+1}-9^n-10\over 27}$
if $n=2$ the RHS is $101/3$ which is not an integer.