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May
17
comment A silly problem on critical points?
@John From the page: "$Sin^{-1}(x)$ is the inverse sine function."
May
17
comment A silly problem on critical points?
@John See here.
May
17
asked A silly problem on critical points?
May
17
revised Barbeau's Polynomials: Quadratic Polynomials, 1.2.2
edited tags
May
17
asked Barbeau's Polynomials: Quadratic Polynomials, 1.2.2
May
17
accepted Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots?
May
17
revised Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots?
edited tags
May
17
asked Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots?
May
14
comment If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
And the author actually gave a similar hint in the beginning of the questions and I completely missed it. I'm so stupid.
May
14
comment If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
Oh. $-1\cdot -1$ and $1 \cdot 1$. I guess I understand it.
May
14
comment If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
@HenningMakholm I explained a little further in the text.
May
14
revised If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
edited body
May
14
asked If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
May
14
comment In a ring, if addition is commutative, does it implies that multiplication is commutative?
@RobertLewis No. See my profile for explanation.
May
14
comment In a ring, if addition is commutative, does it implies that multiplication is commutative?
Of, it seems I confused one thing. Here. He says: "In addition, if $ab=ba$, then it is a commutative ring". I thought he was talking about addition. Silly me.
May
14
asked What are the benefits of using reduction map and lift instead of function and inverse image?
May
14
asked In a ring, if addition is commutative, does it implies that multiplication is commutative?
May
14
accepted How to show that $at^2+bt+c$ can be written as $\displaystyle \begin{equation} a \left( t+\frac{b}{2a}\right) ^2-\frac{1}{4a}(b^2-4ac)\end{equation}$?
May
14
accepted What is $R(k,l)$?
May
14
comment What is $R(k,l)$?
Oh, now I get it. Thanks.