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8h
comment A monotonically increasing series for $\pi^6-961$ to prove $\pi^3>31$
@GerryMyerson A reasonable and natural question in this context is : can we write $\pi^6-961$ as a sum of the form $\sum_{k=1}^{n} \frac{1}{P(k)}$ where $P$ is a polynomial with nonnegative, rational coefficients. This is the case for the examples given in the OP
Feb
6
comment Is it possible to find a perfect cube like 111…11?
No, it is still not correct. See my comment starting with "The correction propagates" above
Feb
6
comment Is it possible to find a perfect cube like 111…11?
The correction propagates : you should write $10(900m^3+270m^2+27m-10^{n-1}+2)-10=0$ rather than $10(900m^3+270m^2+27m-10^{n-1}+2)-1=0$, and $10r-10=0$ rather than $10r-1=0$
Jan
31
awarded  Notable Question
Jan
31
comment Prove $\frac{2ab}{a+b}\leq\sqrt {ab}$
It's mostly correct (except you should write it backwards and replace < with <=) but a little complicated. It is simpler to square each side, simplify by $ab$ and get rid of denominators
Jan
30
answered Factorize $2a^3 - b^3 - c^3$
Jan
27
answered $\mathbb{Q}(\sqrt[3]{17})$ has class number $1$
Jan
27
accepted Algebraic integers divided by a prime
Jan
27
revised Algebraic integers divided by a prime
added 1 character in body
Jan
27
asked Algebraic integers divided by a prime
Jan
26
comment Prove that $\frac{a}{b+2c+3d}+\frac{b}{c+2d+3a}+\frac{c}{d+2a+3b}+\frac{d}{a+2b+3c} \geq \frac{2}{3}.$
This is essentially the same solution as Gordon's.
Jan
15
answered Prove that $X,Y,Z$ lie on a single line.
Jan
9
comment Matrices A+B=AB implies A commutes with B
@Freeze_S There is no flaw. In general the polynomial (which I call $Q$) will have nothing to do with a Taylor expansion.
Jan
5
reviewed Approve Find the determinant of the following matrix
Jan
4
asked Polynomial whose roots are not integers but almost so
Dec
21
answered Proving $(ax+by-1)^2 \ge (x^2+y^2-1)(a^2+b^2-1)$
Dec
21
revised Canonical colorings over $ \omega $
added 134 characters in body
Dec
21
answered A sequence of quadratic polynomials
Dec
18
comment Show that $\lim\limits_{r\to\infty} \textrm{\{} \|x-ru\|-\|y-ru\| \textrm{}\} = \left<y-x,u\right>$
It is clearer now, indeed.
Dec
18
comment Show that $\lim\limits_{r\to\infty} \textrm{\{} \|x-ru\|-\|y-ru\| \textrm{}\} = \left<y-x,u\right>$
The last step is not very clear.