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DCarter
  • Member for 7 years, 6 months
  • Last seen more than 4 years ago
  • Nahant, MA, United States
10 votes

Right inverse of $f(x)= x^2$ that is not $\pm \sqrt x$

6 votes
Accepted

Prove that there exist infinitely many primes that do not belong to any pair of twin primes

4 votes

Intersection of normal subgroups proof

4 votes
Accepted

Show similarity of block matrices

3 votes
Accepted

How to construct isomorphisms between finite field?

3 votes

Let $T : R^7 \to R^7$ be a linear transformation such that $T^2 = 0$

2 votes

Find a basis for $\Bbb R^3$ if and only if k does not equal __

2 votes
Accepted

Discrete Mathematic Group Theory

2 votes
Accepted

Prime matrix rings

2 votes
Accepted

A question about isomorphic of dihedral group

2 votes
Accepted

My argument on normalizer of Sylow-P subgroups

2 votes

Proof regarding the positive definite matrix

2 votes

Applying the Chinese remainder theorem to the ring of polynomials

2 votes

Calculate determinant without using the rule of sarrus or the method of minors

2 votes
Accepted

Suppose $a,b,m,n$ are natural numbers, prove that if $a({m \over n})=b$ and $(a,n)=1$, then ${m \over n} \in \mathbb{N}$

1 vote
Accepted

How to count number of sets of $d$ linearly independent vectors of length $n$ from $F_2^n$.

1 vote
Accepted

Intersection of spans

1 vote

What is $\sin(nx)$ iteration in terms of $\sin A$ and $\cos A$?

1 vote

Give an example of a convergent series .

1 vote

True or False Linear Transformation Eigenvalues Question

1 vote

Let $A$ be a fixed $3 \times 3$ matrix and define a linear map $T: M_{33}→M_{33}$ by $T(X)=AX$.

1 vote

Sum of the digits of the sum of the digits of the sum of the digits of $4444^{4444}$?

1 vote

find unknowns with periodic

1 vote
Accepted

find unknowns with periodic

1 vote

Determine a vector for a $3\times 3$ matrix so it becomes positive orthogonal

1 vote

Given two angle and a segment, can you find $h$?

1 vote

Am I correct? Finding all vectors orthogonal to these two vectors

1 vote

What are the paths for this adjacency matrix?

1 vote

Diagonalizability of a matrix.

0 votes

Finding eigenvalues for a 4x4 matrix?