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WhatsUp
  • Member for 8 years, 11 months
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14 Earned bounties for 1,225 reputation

4 votes
+25

Prove that if $f^2(x+y)+f^2(x-y)=2f^2(x)+2f^2(y)$ then $f(x+y) \leq f(x)+f(y)$ for all $x,y \in \mathbb R$

2 votes
+25

Prove that $p$ is a primitive root of $q$ if and only if $\frac{x^q-1}{x-1}$ is an irreducible polynomial on $\mathbb{F}_p$

5 votes
+100

If we place $1$ to $n^2$ in an $n\times n$ table, what is the smallest $s$ where $s$ is the max of $a+b$ where $a,b$ are numbers in adjacent cells?

1 vote
+50

Show that $m^{*}([a, b]\backslash G)=b − a- m^{*}{(G)}$

11 votes
Accepted
+50

Interesting behavior of the $2$-tag system $\{a\rightarrow abc,b\rightarrow ab,c\rightarrow c\}$

6 votes
Accepted
+50

Interchanging $x$ and $y$ in Taylor's Theorem for $f(x+y)$; is there a deeper reason for equality?

12 votes
Accepted
+500

Number of paths on $\mathbb Z^d$

2 votes
Accepted
+100

There is no continuous surjective multiplicative map from $M_n(\mathbb H)$ to $\mathbb H$

1 vote
Accepted
+100

A few questions on subfields of $Q(\zeta_n)$

2 votes
Accepted
+50

$G\:/\:H$, where $G = \mathbb{Z} \oplus \mathbb{Z}$ and $H = \langle(1,3) , (3,1)\rangle$

3 votes
+25

Units of $\mathbb{Z}[\sqrt {-2}]$, and are $3,5$ irreducible in $\mathbb{Z}[\sqrt {-2}]$?

0 votes
Accepted
+50

Find $f \in I(V(J))$ but $f \notin J$

2 votes
Accepted
+50

Comment of Gauss, on the even integer $x$, in the $p=x^2+y^2$, for primes of the form $p \stackrel{4}{\equiv} 1$

2 votes
Accepted
+50

Computing henselization DVR