User Alim Teacher - Mathematics Stack Exchange

Alim Teacher

Member for 9 years, 6 months
Last seen more than 1 year ago

Roskilde University, Denmark

Network profile

78 Questions

Score Activity Newest Views

31 votes

4 answers

70k views

Show that the eigenvalues of a unitary matrix have modulus $1$

asked Mar 28, 2016 at 20:39

8 votes

0 answers

11k views

Show that $1^k+2^k+...+n^k$ is $O (n^{k+1})$.

asked Apr 23, 2015 at 17:45

5 votes

3 answers

17k views

solve $y'=ay+b$ [duplicate]

asked Dec 17, 2014 at 20:44

3 votes

2 answers

7k views

Show that $\neg$ and $\wedge$ form a functionally complete collection of logical operators.

asked Mar 16, 2015 at 19:01

3 votes

4 answers

8k views

show that $f(x)=-3x+4$ is bijective

asked Apr 16, 2015 at 11:39

3 votes

1 answer

686 views

What is the set of propositional formulas?

asked May 6, 2015 at 19:02

3 votes

1 answer

290 views

Prenex normal form of $\neg \big(\forall x \ P(x) \vee \forall x \ Q(x) \big)$

asked Mar 22, 2015 at 22:22

3 votes

2 answers

802 views

If $A$ is a real symmetric matrix, then $A$ has real eigenvalues.

asked Aug 30, 2016 at 13:10

2 votes

1 answer

431 views

Understanding why $(a^{-1})^{-1} = a$ in a group

asked Aug 28, 2016 at 21:08

2 votes

2 answers

473 views

Show that a function is differentiable

asked Jan 29, 2017 at 15:54

2 votes

1 answer

78 views

Verify that $\| T(x) \| = \| x \|$

asked Mar 14, 2016 at 11:59

2 votes

2 answers

866 views

The general solution for inhomogeneous differential equation

asked Oct 21, 2015 at 10:58

2 votes

3 answers

5k views

Let $A_i= \left \{...,-2,-1,0,1,...,i \right\}$. Find $\bigcup_{i=1}^{n} A_i$ and $\bigcap_{i=1}^{n} A_i$

asked Apr 9, 2015 at 21:31

2 votes

4 answers

111 views

Evaluate the integral $\int_{0}^{4}\sqrt{9t^2+t^4}dt$

asked Nov 13, 2014 at 11:34

2 votes

2 answers

81 views

Given two series $ x_n $ and $ y_n $

asked May 14, 2014 at 11:09

2 votes

3 answers

84 views

Find the tangen to $\cos(\pi \cdot x)$

asked Oct 21, 2014 at 17:36

1 vote

1 answer

2k views

A urine test, the VMA test

asked Sep 20, 2014 at 15:35

1 vote

2 answers

43 views

Given an expression

asked Oct 15, 2014 at 12:16

1 vote

1 answer

71 views

Given a sequence of a function $f_n({x})$

asked May 15, 2014 at 11:23

1 vote

1 answer

92 views

Find the derivatives to $f(x)=4/x^2$ and $g(t)=(t-5)/(1+\sqrt{t}\,)$

asked Oct 18, 2014 at 11:46

1 vote

2 answers

60 views

How can the equation $e^{-x^{2}}-2x^2e^{-x^{2}}=0$ be solved

asked Oct 26, 2014 at 21:27

1 vote

1 answer

1k views

Statements in prenex normal form.

asked Mar 22, 2015 at 14:44

1 vote

1 answer

336 views

Let $\tau$ be a closed tableau. Prove that $\tau$ is not satisfiable.

asked Apr 5, 2015 at 15:11

1 vote

3 answers

3k views

Show that if $A$ and $B$ are sets, then $(A\cap B) \cup (A\cap \overline{B})=A$.

asked Apr 9, 2015 at 20:32

1 vote

1 answer

53 views

First-Order Linear Differential Equations

asked Oct 15, 2015 at 13:08

1 vote

3 answers

56 views

Differential equation $y'+10t=0$

asked Oct 19, 2015 at 18:36

1 vote

1 answer

2k views

Show that $f$ is one-to-one if and only if it is onto.

asked Apr 16, 2015 at 15:03

1 vote

1 answer

86 views

Phase plane analysis

asked Oct 28, 2015 at 22:43

1 vote

0 answers

44 views

Finding solution for a differential equation in the form $\frac{dC}{dt}=k_2B$

asked Nov 4, 2015 at 11:07

1 vote

1 answer

37 views

Finding limit if it exist

asked Nov 5, 2015 at 20:48

1