User Bambeil

3 votes

4 answers

234 views

Differential equation $y'' - y + 2\sin(x)=0$

asked May 7, 2019 at 8:46

2 votes

2 answers

76 views

Find minimum of function and minimum point

asked Feb 27, 2019 at 19:24

2 votes

1 answer

841 views

Is the extension $\mathbb{Q}(\sqrt{5},\sqrt{7})$ simple? If so/not, why?

asked Mar 17, 2019 at 23:22

2 votes

2 answers

219 views

Show that degree of $\mathbb{Q}(\sqrt{1+\sqrt3}):\mathbb{Q}=4$

asked Mar 25, 2019 at 7:19

1 vote

3 answers

531 views

Solve PDE $u_{xy}+xyu+yu_{x} + xu_{y}=0$

asked Mar 31, 2019 at 8:34

1 vote

1 answer

198 views

The degree of extension

asked Mar 24, 2019 at 21:22

1 vote

1 answer

42 views

Concerning extensions of the rationals

asked Mar 24, 2019 at 21:57

1 vote

1 answer

74 views

Is the quotient space finite-dimensional linear space?

asked Nov 11, 2018 at 17:08

0 votes

2 answers

98 views

Solve the differential equation $x''=9.8-k(x')^2$

asked Nov 13, 2018 at 23:07

0 votes

1 answer

20 views

Prove that $V=\{(x_1,x_2,x_3,..):(x_1,2x_2,3x_3,..)\in l_\infty\}$ is linear space

asked Nov 15, 2018 at 19:55

0 votes

1 answer

65 views

Prove that $f$ is differentiable in a whole $\mathbb{C}$ set. [closed]

asked May 3, 2018 at 19:48

0 votes

1 answer

162 views

The proof that $\sqrt{q}$ is a rational number iff $q$ is a perfect square

asked Feb 17, 2019 at 18:33

0 votes

1 answer

358 views

Inequality $\deg(f-g) \le \max(\deg(f),\deg(g))$

asked Feb 18, 2019 at 11:56

0 votes

1 answer

235 views

Check that the corresponding extensions are normal

asked May 13, 2019 at 8:16

0 votes

2 answers

42 views

The set {${m^m}/{n^n}: m,n\in \mathbb{N}$} density in ${\mathbb{Q}_+}$

asked Nov 8, 2018 at 22:35

-1 votes

2 answers

392 views

Dihedral and permutation groups isomorphism [closed]

asked May 20, 2019 at 11:47

-1 votes

1 answer

74 views

Is the extension $\mathbb{Q}(\alpha)/\mathbb{Q}$, where $\alpha = 2\pi i /3$, a splitting extension? [closed]

asked May 13, 2019 at 10:59

-1 votes

1 answer

87 views

Are sets everywhere dense in rational numbers set?

asked Nov 1, 2018 at 22:22

-2 votes

2 answers

57 views

Is it v1,v2,v3,.. converging sequence of space $\mathbb{E}$? [closed]

asked Nov 22, 2018 at 19:37

-2 votes

1 answer

257 views

Is the symmetry group of the square isomorphic to $\mathbb{Z_8}$? to $\mathbb{S_8}$? to a subgroup of $\mathbb{S}_8$? [closed]

asked May 20, 2019 at 6:36

Stack Exchange Network

20 Questions

Differential equation $y'' - y + 2\sin(x)=0$

Find minimum of function and minimum point

Is the extension $\mathbb{Q}(\sqrt{5},\sqrt{7})$ simple? If so/not, why?

Show that degree of $\mathbb{Q}(\sqrt{1+\sqrt3}):\mathbb{Q}=4$

Solve PDE $u_{xy}+xyu+yu_{x} + xu_{y}=0$

The degree of extension

Concerning extensions of the rationals

Is the quotient space finite-dimensional linear space?

Solve the differential equation $x''=9.8-k(x')^2$

Prove that $V=\{(x_1,x_2,x_3,..):(x_1,2x_2,3x_3,..)\in l_\infty\}$ is linear space

Prove that $f$ is differentiable in a whole $\mathbb{C}$ set. [closed]

The proof that $\sqrt{q}$ is a rational number iff $q$ is a perfect square

Inequality $\deg(f-g) \le \max(\deg(f),\deg(g))$

Check that the corresponding extensions are normal

The set {${m^m}/{n^n}: m,n\in \mathbb{N}$} density in ${\mathbb{Q}_+}$

Dihedral and permutation groups isomorphism [closed]

Is the extension $\mathbb{Q}(\alpha)/\mathbb{Q}$, where $\alpha = 2\pi i /3$, a splitting extension? [closed]

Are sets everywhere dense in rational numbers set?

Is it v1,v2,v3,.. converging sequence of space $\mathbb{E}$? [closed]

Is the symmetry group of the square isomorphic to $\mathbb{Z_8}$? to $\mathbb{S_8}$? to a subgroup of $\mathbb{S}_8$? [closed]