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Annalisa
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6 votes
5 answers
391 views

What are significant differences between polynomial rings and the ring of formal power series?

3 votes
0 answers
43 views

Question about homomorphism of algebras

3 votes
2 answers
65 views

Find a $T_pM$ and $N_pM$

3 votes
3 answers
219 views

Same minimal polynomial gives isomorphism

2 votes
2 answers
36 views

Solve the Integral in the following set

2 votes
2 answers
40 views

Would the following sum give me the following numbers?

2 votes
2 answers
92 views

Prove that a function $u: u= \ln\|x\|{_{2}}$ has $\Delta u = 0$.

2 votes
0 answers
48 views

Let A be $A=${$xy:x \in (0; 1/2),y \in \mathbb{Z}, |y|<3$}. Which is the value of $\inf A+\sup A$?

2 votes
1 answer
59 views

Calculate the following Integral $\int_{0}^{\infty} \frac{|\sin(\pi*x)|}{\lfloor x \rfloor} dx$

2 votes
2 answers
59 views

Questions about following proof regarding why $\mathbb{Z}[x]$ is not a principal ideal domain

2 votes
0 answers
58 views

Are the following embeddings of the graph $K_{5}$ in the Möbius strip correct?

2 votes
2 answers
145 views

Tables of $\mathbb{Z}/6\mathbb{Z}$ and $\mathbb{Z}/2\mathbb{Z} \times \mathbb{Z}/3\mathbb{Z}$?

1 vote
1 answer
61 views

What does this step in the following matrix algorithm mean?

1 vote
0 answers
80 views

Find irreducible polynomials of degree 3 and 4 in $\mathbb{F}_{11}[x]$

1 vote
2 answers
59 views

Solve following ODE $(1-x^2)y''-xy'-2=0$

1 vote
1 answer
62 views

Is $\mathbb{C}[x,y]/(x^2+y)$ a UFD?

1 vote
1 answer
38 views

Find all linear integer relations of following vectors

1 vote
1 answer
200 views

The identity map in two metric spaces is a homeomorphism

1 vote
2 answers
98 views

Find all the solutions of the equation $x^3=2$ in the field $\mathbb F_{25}$

1 vote
4 answers
94 views

Show that following modules are isomorphic

1 vote
1 answer
57 views

Lattice in $\mathbb{R}^3$

1 vote
1 answer
119 views

When does lattice equal the whole $\mathbb{Z}^n$

1 vote
0 answers
79 views

Prove the following identity (Fibonacci) using induction [duplicate]

1 vote
1 answer
46 views

Are the following modules free and/or isomorphic?

1 vote
1 answer
57 views

Show that the following set defines a Topology in X

1 vote
3 answers
166 views

Calculate the value of the following limit

1 vote
1 answer
47 views

Find the critical points of the function $f(x,y)=(y-x^2)(y-2x^2)$ and examine if they are local extremums.

1 vote
2 answers
57 views

Checking the convergence of the improper integral

1 vote
0 answers
38 views

Prove that the function $u= \|x\|{_{2}^{2-n}} $ has $\Delta u = 0 $?

1 vote
2 answers
43 views

Let $a_{n} \in \mathbb N $ be a sequence and $a_{n}\rightarrow +\infty$. Which of the following sentences is correct.