Klaus Draeger's user avatar
Klaus Draeger's user avatar
Klaus Draeger's user avatar
Klaus Draeger
  • Member for 10 years, 11 months
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15 votes

How to prove that the Fibonacci sequence is periodic mod 5 without using induction?

5 votes

Giving a specific example of a positive sequence increasing to 1 and with its partial products having a positive limit

4 votes
Accepted

If $G = \{a + b: a, b \in A\}$ a group, then is $A$ a group?

4 votes
Accepted

Proof of 3-chain subsequence problem from assignment 2 of MIT OCW 6.042

3 votes
Accepted

Does $k\cdot x < y$ imply that $x \ne y$?

2 votes

Determinant of Adjacency Matrix is null

2 votes

How do you compute eigenvalues/vectors of big $n\times n$ matrix?

2 votes

How do you create an alternating series with the sign being the same twice in a row?

2 votes

To prove a sequence is Cauchy

2 votes

If $\frac{a}{b}<\frac{c}{d}$ and $\frac{e}{f}<\frac{g}{h}$, then $\frac{a+e}{b+f} < \frac{c+g}{d+h}$.

2 votes
Accepted

Why this matrix is not a distance matrix?

2 votes
Accepted

Recursive definition of a set of strings.

2 votes
Accepted

expressing inclusive OR using exclusive OR.

2 votes

show that in a group of five people (where any two people are either friends or enemies)...

2 votes
Accepted

After how many days did Akbar join Ajay given the following conditions.

1 vote

Find the remainder when $21^3$ +$23^3$+$25^3$+$27^3$ is divided by $96$?

1 vote

If $ab(a+b)=2$ then what will be the value of $\frac{1}{(ab)^3}-a^3-b^3$?

1 vote

Why does = change to $\leq$ and then to = in this proof of |a+b| = |a|+|b|?

1 vote
Accepted

Prove that regular languages are closed under operation

1 vote

6 lamp at the circumcircle

1 vote

How to prove $\gcd(a,b) \cdot \gcd(c,d)=\gcd(ac,ad,bc,bd)$?

1 vote
Accepted

Can't solve this exercise

1 vote
Accepted

Finding the Dimension of a given space $V$

0 votes

How can I calculate the dot product of two vectors if I know both dot products with a third vector?

0 votes

Function to express a time interval with results between 0 and 1

0 votes

$|\mathbb N^{\mathbb N}| = |2^\mathbb N|$ by finding a bijection

0 votes
Accepted

Example of an unbounded sequence whose convergent subsequences converge to same limit