Maffred's user avatar
Maffred's user avatar
Maffred's user avatar
Maffred
  • Member for 8 years, 6 months
  • Last seen more than a month ago
  • Rome
9 votes
Accepted

Give a combinatorial proof for a multiset identity

7 votes

Is this matrix a root of the given polynomial?

6 votes

Find all the prime factors of $1000027$

6 votes

Prove $\frac{2ab}{a+b}\leq\sqrt {ab}$

6 votes

Prove that $t$ does not have multiplicative inverse in $\mathbb{C}[t]$

5 votes

Is $\mathbb{Z}[\sqrt{-7}]$ a UFD or not?

5 votes

Proving that if $a\mid b$ and $b\mid a$, then $a = \pm b$ for $a,b$ as nonzero integers?

4 votes

Determining certain units in a local ring.

4 votes
Accepted

Proof of irreducibility of $x^2+1$ over $\mathbb{Z}_p[x]$

4 votes

NET matrix problem

4 votes
Accepted

Show $\{1,3,5,7,9,11,13,15\} \cong \mathbb{Z}_2 \times \mathbb{Z}_4$

4 votes

Finding product of odd/even integers

4 votes
Accepted

If $A\in \Bbb{R}^2$ is countable then $\Bbb{R}^2\setminus A$ is polygonally connected

4 votes

Why $x^5y\equiv y^5x\pmod {240}$ if $x,y$ have similar parity?

3 votes

Is it possible to have three real numbers that have both their sum and product equal to $1$?

3 votes
Accepted

How can I find Linear transformation $T: \mathbb R_2 [x] \to M_2(\mathbb R)$ so that $Ker$ $T=0$?

3 votes
Accepted

Calculus problem of finding the equation of a line.

3 votes

The straight lines are contained in $S$

3 votes

Sufficient condition to show $f$ is monotonically increasing in some neighborhood

3 votes

How to find a quadratic equation given three points, two on the x-axis?

3 votes

Range of continuous function related

3 votes

Permutations with restrcitions

3 votes
Accepted

52 cards are equally given to 4 players Find probability that one of them has 3 spades out of remaining 5.

3 votes

Show that the number $z=\sqrt[3]{4}-2i$ is algebraic, that is satisfied a polynomial equation with integer coefficients.

3 votes

Unique factorization theorem in algebraic number theory

3 votes

Perfect square is $0$ or $1$ modulo $4$ .

3 votes

Sum of possible all possible $x$ such that $51 \equiv 3 \pmod{x}$

3 votes
Accepted

Finding the integral closure of $\mathbb{Z}$ in $\mathbb{Q}[i]$

3 votes

Is there a solution for $x^6 \equiv 5 \pmod {71}$?

3 votes

Prove or disprove : the number $3+2\sqrt{-2}$ is irreducible in the ring $\mathbb{Z}[\sqrt{-2}]$

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