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12 votes

Cyclic Group Generators of Order $n$

8 votes
Accepted

Is $f(x)=x^2$ from $\mathbb{R} \to \mathbb{R}$ surjective?

7 votes

Why is $ab=(a-b)(a+b)$ false when $a,b$ are coprime?

6 votes
Accepted

Checking if two matrices are similar

6 votes

Finding consecutive naturals that all fail to have inverses modulo $70$

5 votes

Can a field with cardinality $3$ be an ordered field?

5 votes
Accepted

Is [a, b) open or closed in R?

5 votes
Accepted

Proof of $0x=0$

4 votes
Accepted

Proving $\phi(G)$ is cyclic if $\phi$ : $G \to H$ is group homomorphism and $G$ is cyclic

4 votes

Function transformations - what went wrong here...

4 votes

Ways to put $50$ balls into $6$ distinct urns with an odd number in each urn?

4 votes
Accepted

Complement of a prime ideal is a subset closed under multiplication, containing 1

4 votes

Proof of $a \equiv b \mod n$ implies $a^k \equiv b^k \mod n$

4 votes
Accepted

Is this subset a basis of the vector space?

3 votes
Accepted

Transitivity of a relation (unique)

3 votes
Accepted

True or false? The matrix $M$ is not diagonalisable

3 votes

Help me understand linear function.

3 votes
Accepted

What is the order of $\mathbb{Z}_2\times\mathbb{Z}$?

3 votes

Prove: if $c^2+8 \equiv 0$ mod $p$ then $c^3-7c^2-8c$ is a quadratic residue mod $p$.

3 votes
Accepted

Find the solutions of $2z^3+2z^2=4$ with one of them being 1 using the rational root theorem.

3 votes
Accepted

Understanding why linear independent columns relate to positive definite matrix and invertibility

3 votes

Stationary point of a smooth function $f:\Bbb R^2\to \Bbb R$

3 votes
Accepted

Is the inverse of continuous function on compact a continuous function?

2 votes

Analytic Geometry: line parallel to a plane

2 votes
Accepted

Find the volume of the region above the triangle in the xy-plane with vertices (0,0),(1,0),(0,1) and below the surface z=6xy(1-x-y)

2 votes

Matrix algebra linear transformation question

2 votes

How does eve find the message m that Bob encrypted?

2 votes

Proving a vector space is infinite-dimensional

2 votes

$p_n \to r, q_n \to r, \alpha_n , \beta_n \in [0,1]$ and $\alpha_n + \beta_n =1$ for all $n$, prove that $p_n \alpha_n +q_n \beta_n\to r$

2 votes

How would I find the critical values of an absolute value function? $y=|x+1| + |x-1|$ over $[3, -2]$

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