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 1d reviewed Approve Problem involving subspaces and linear transformations 2d comment Why is The Following equality true? (limit of a sum and integrals) en.wikipedia.org/wiki/Riemann_sum#/media/… 2d comment What is the value of $k^2$ is $f`$ a typo or should it be $f'$ (with a single apostrophe) 2d revised Prime number theory. format, wording Apr 28 comment Right Triangle's Proof You write "Wikipedia" but you link to mathworld.wolfram.com/PythagoreanTriple.html . All in all it is a rather complicated and inelegant way to prove this simple fact. Apr 28 revised How do I prove that $\lim_{z\to i} z^2=-1$? format Apr 28 comment A simple cubic equation problem: And why can I suppose that $z_3=\dfrac{1}{\bar{z_1}}$? Apr 28 comment Right Triangle's Proof But if you check this three cases you get $b^2$ is $63$, $44$ or $23$. So 12 actually can't be the lenght of the hypotenuse because none of these numbers is a perfect square. Apr 28 comment Right Triangle's Proof No, I said if you want to check if 12 is the length of the hypotenuse $c$ you only have to check the three cases where $a$ is $9$, $10$ or $11$. Apr 28 reviewed Edit Find derivative of $4\cos(x - \frac{311\pi}{180})$ Apr 28 revised Find derivative of $4\cos(x - \frac{311\pi}{180})$ fix \cdot instead of x and sin and cos Apr 28 comment A simple cubic equation problem: How does this imply that tthere is a root with absolute value 1? Apr 28 revised Right Triangle's Proof typos Apr 28 revised Right Triangle's Proof typo Apr 28 answered Right Triangle's Proof Apr 28 reviewed Approve Right Triangle's Proof Apr 28 comment Solution of functional equation $f(x+y)=f(x)+f(y)+y\sqrt{f(x)}$ So there are four solutions. Apr 28 comment Solution of functional equation $f(x+y)=f(x)+f(y)+y\sqrt{f(x)}$ $f(x) =0$ is a solution, too.And $f(x)=0$ if $x<0$ and $f(x)=\frac{x}{4}$ if $x \ge 0$ ... Apr 25 comment Why can't a open interval in $\mathbb{R}$ be compact? how are compactness and sequentially compactness related? Apr 24 answered How to write the following polynomial in $(1-\frac{x}{a}) (1-\frac{x}{b}) (1-\frac{x}{c}) (1-\frac{x}{d})$?