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May
3
answered Are 0 and -1 the only rational periodic solutions of $z_{n}\equiv z_{n-1}^{2}+c$?
May
3
comment Are 0 and -1 the only rational periodic solutions of $z_{n}\equiv z_{n-1}^{2}+c$?
Do you want periodic or eventually periodic?
May
3
comment How can i prove a closed ball is the closure of a open ball?
The statement is not true in general metric spaces, so you may want to mention your spaces of interest ...
May
3
comment Constructing a 15+ vertex graph with specific conditions.
If the minimum degree equals 3, you cannot have an Eulerian circle, only an Eulerian path
May
3
comment Constructing a 15+ vertex graph with specific conditions.
N.B. 2-connected means that the removal of 1 vertex does not disconnect the graph
May
3
awarded  inequality
May
3
comment How is the shape of a quadratic Bézier curve affected by the anchor points being equidistant or different distances from the control point?
As you speak of the control point, I assume you mean a quadratic Bézier curve. In that case the curve is a parabola tangent to the lines connecting anchor and control and relocating the control point (and/or the anchor points) causes an affine transformation of that parabola ...
May
2
comment How to show $\frac{19}{7}<e$
@Bernard No. $\sum_{n=0}^3\frac1{n!}=\frac83<\sum_{n=0}^4\frac1{n!}=\frac{65}{24}<\frac{19}7$
May
2
revised Why is $R((X))$ defined as follows?
added 253 characters in body
May
2
comment Why is $R((X))$ defined as follows?
Hm, I assume the downvote is because I did not restate the formal definitions of all those constructs?
May
2
answered Why is $R((X))$ defined as follows?
May
2
revised Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent?
added 766 characters in body
May
2
revised Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent?
added 766 characters in body
May
2
answered Is the series $\sum_{n=1}^\infty\frac{n^n}{n!e^n}$ divergent?
May
2
comment Are there infinite self-locating strings in the decimal expansion of $\pi$?
The problem for $\frac19$ is simpler :)
May
2
answered Show that $\sin(x) > \ln(x+1)$ for any $x \in (0,1)$
May
2
comment How to show $\frac{19}{7}<e$
The Taylor method needs only $\sum_{n=0}^5\frac1{n!}=\frac{163}{60}$, which has a moderate denominator. $163\cdot 7-19\cdot 60 = 1$
May
2
comment Prove that if $ab \equiv cd \pmod{n}$ and $b \equiv d \pmod n$ and $\gcd(b, n) = 1$ then $a \equiv c \pmod n$.
The gcd condition implies that $b$ (hence also $d$) is invertible
May
2
comment ZFC and cardinality
What is even missing from the result, given those hints?
May
2
comment Subgroups of $\mathbb{Q}/ \mathbb{Z}$
You mean all proper subgroups?