User 138 Aspen

4 votes

Determine the number of odd binomial coefficients in the expansion of $(x+y)^{1000}$.

answered Dec 17, 2022 at 7:50

4 votes

Conjecture about prime numbers and fibonacci numbers

answered Aug 22 at 12:35

3 votes

Solving $\cos\phi\cos(2\theta - \phi)+\sin(\theta - \phi)\sin(\theta + \phi)=0$ for $\theta$

answered Aug 25 at 3:14

3 votes

closed form expression for the summation $\sum_{i=0}^{\infty}\binom{i+k}{i}x^ii^t$

answered Aug 25 at 1:03

2 votes

What is the probability that the sum of 6 four-sided dice is less than or equal to 14?

answered Jan 28 at 8:54

2 votes

Then number of ways of arranging the letters of word ALGEBRA in which either vowels or consonants but not both appear in alphabetical order

answered Feb 5 at 1:31

2 votes

Accepted

Exercise on Dijkstra's algorithm

answered Dec 17, 2022 at 12:33

2 votes

Counting (0,1)-matrices with a given characteristic polynomial

answered Nov 4 at 1:51

2 votes

Counting diagonalizable matrices?

answered Aug 10 at 1:27

1 vote

Count of $3 \times 3$ matrices with sum $> 21$

answered May 16 at 5:49

1 vote

Five cards from a standard deck are lined up in a row. How many of these line ups contain exactly one queen?

answered Jul 22 at 3:14

1 vote

How would I go about calculating the center of a sphere based on points from it's surface?

answered Aug 25 at 6:42

1 vote

Number of spanning trees

answered Dec 17, 2022 at 13:04

1 vote

Fourier series of $f(x)=\pi -x$ for $x \in [0,2\pi]$

answered Jan 6 at 11:08

1 vote

Tutte polynomial

answered Dec 17, 2022 at 13:34

1 vote

Recurrence formula of the MacMahon $q$-analog of the Catalan numbers

answered Jan 10 at 11:51

1 vote

In how many ways can $k$ vertices be inserted somewhere on the $n$ sides of a polygon?

answered Jan 5 at 2:11

1 vote

Proving or disproving planarity

answered Dec 17, 2022 at 10:54

1 vote

Find a graph such that $\kappa(G) < \lambda(G) < \delta(G)$

answered Dec 17, 2022 at 11:39

1 vote

Probability of not having a path between two certain nodes, in a random graph

answered Apr 3, 2021 at 5:18

1 vote

Plotting $(x^2 + y^2 - 1)^3 - x^2 y^3 = 0$

answered Dec 21, 2022 at 0:46

1 vote

Accepted

Example of a Minimum Cost Capacitated Flow Problem

answered May 3 at 5:55

1 vote

Find the maximum of $x^3_{1}+x^3_{2}+x^3_{3}-x_{1}x_{2}x_{3}$ subject to $0 \le x_i \le i, \forall i$

answered Jun 8 at 2:26

1 vote

Theorem 6.9 in A Walk Through Combinatorics

answered Jan 26 at 0:37

1 vote

Accepted

What's the number of solutions for $x_1 + x_2 + x_3 + ... + x_k = n$ where $x_i \neq x_j$, for all $i, j \in {1\dots k}$

answered Mar 28 at 23:06

1 vote

The normalized unit group using GAP.

answered Apr 2 at 1:26

1 vote

What is the inverse fourier transformation of $\frac{1}{i\sinh(\omega \tau)}$

answered Apr 2 at 13:27

0 votes

$f(x)$ = $\int_1^x \sin(\cos t)\,dt\,$

answered Apr 7 at 7:50

0 votes

Domain of $g(x)=\sqrt{\sin(π\sin(πx))}$

answered Jun 23 at 5:13

0 votes

Number of permutations such that no two elements swap places

answered Mar 24 at 9:08

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53 Answers

Determine the number of odd binomial coefficients in the expansion of $(x+y)^{1000}$.

Conjecture about prime numbers and fibonacci numbers

Solving $\cos\phi\cos(2\theta - \phi)+\sin(\theta - \phi)\sin(\theta + \phi)=0$ for $\theta$

closed form expression for the summation $\sum_{i=0}^{\infty}\binom{i+k}{i}x^ii^t$

What is the probability that the sum of 6 four-sided dice is less than or equal to 14?

Then number of ways of arranging the letters of word ALGEBRA in which either vowels or consonants but not both appear in alphabetical order

Exercise on Dijkstra's algorithm

Counting (0,1)-matrices with a given characteristic polynomial

Counting diagonalizable matrices?

Count of $3 \times 3$ matrices with sum $> 21$

Five cards from a standard deck are lined up in a row. How many of these line ups contain exactly one queen?

How would I go about calculating the center of a sphere based on points from it's surface?

Number of spanning trees

Fourier series of $f(x)=\pi -x$ for $x \in [0,2\pi]$

Tutte polynomial

Recurrence formula of the MacMahon $q$-analog of the Catalan numbers

In how many ways can $k$ vertices be inserted somewhere on the $n$ sides of a polygon?

Proving or disproving planarity

Find a graph such that $\kappa(G) < \lambda(G) < \delta(G)$

Probability of not having a path between two certain nodes, in a random graph

Plotting $(x^2 + y^2 - 1)^3 - x^2 y^3 = 0$

Example of a Minimum Cost Capacitated Flow Problem

Find the maximum of $x^3_{1}+x^3_{2}+x^3_{3}-x_{1}x_{2}x_{3}$ subject to $0 \le x_i \le i, \forall i$

Theorem 6.9 in A Walk Through Combinatorics

What's the number of solutions for $x_1 + x_2 + x_3 + ... + x_k = n$ where $x_i \neq x_j$, for all $i, j \in {1\dots k}$

The normalized unit group using GAP.

What is the inverse fourier transformation of $\frac{1}{i\sinh(\omega \tau)}$

$f(x)$ = $\int_1^x \sin(\cos t)\,dt\,$

Domain of $g(x)=\sqrt{\sin(π\sin(πx))}$

Number of permutations such that no two elements swap places