# Tagged Questions

Enumerative combinatorics, graph theory, order theory, posets, matroids, designs and other discrete structures. It also includes algebraic, analytic and probabilistic combinatorics.

**5**

**0**answers

### Double Counting: Motivic Edition

**0**

**1**answer

### Can the union of difference sets in towers equal $\omega$?

**14**

**2**answers

### Eigenvalues and eigenvectors of the matrix with entries $\dbinom{n+1}{2j-i}$ for $i, j = 1, 2, \ldots, n$

**3**

**0**answers

### Halin Graphs with Highest Number of Hamilton Cycles

**12**

**2**answers

### Can we realize a graph as the skeleton of a polytope that has the same symmetries?

**2**

**0**answers

### The name for injective map $f:\mathbb{N}\rightarrow\mathbb{N}$ with $f(n)\geq n$ property

**4**

**1**answer

### Two disjoint trees

**2**

**1**answer

### Colored balls and bins — asymptotic behavior

**5**

**3**answers

### Algorithm to decide if the union of a set system covers the power set

**12**

**1**answer

### A matrix identity related to Catalan numbers

**2**

**0**answers

### 2-dimensional smooth lattice polytopes with minimal edge lengths

**1**

**0**answers

### Simple polytope with smooth facets

**4**

**1**answer

### Minimal covers in hypergraphs with finite edges

**1**

**0**answers

### Combinatorial and computational problem related to Weyl groups and the coroot lattice

**12**

**2**answers

### Cycle generating function of permutations with only odd cycles

**3**

**1**answer

### What is the probability for a Binomial to be greater than other?

**24**

**1**answer

### Has the $E_8$-based generating function for squares numbers been proven?

**2**

**2**answers

### Set of strings $S$ such that no string from $S$ is a substring of another one

**2**

**1**answer

### Maximality with respect to the splitting property

**3**

**0**answers

### Dirichlet eta function and Stirling Permutations

**5**

**0**answers

### Polychromatic number of plane

**5**

**1**answer

### Counting promenades on graphs

**2**

**0**answers

### On the existence of a certain graph/hypergraph pair

**5**

**0**answers

### How to pack 27 $a\times b\times c$ blocks into a cube of side $a+b+c$ with some kind of symmetry?

**1**

**0**answers

### Matchings in infinite, not necessarily bipartite, graphs

**11**

**1**answer

### A curious valuation of this sequence

**2**

**0**answers

### Counting hyperplane arrangements up to combinatorial equivalence, simple examples and history

**5**

**1**answer

### Why is the number of Perfect Matchings in a triangular grid equivalent to the number of Royal Paths?

**6**

**1**answer

### Smallest set of nonzero vectors in $\mathbb F_2^n$ which intersects every 2-dimensional subspace

**2**

**2**answers

### Random walk and isoperimetric constant

**1**

**1**answer

### A weaker version of Dirac's theorem

**3**

**1**answer

### variant of Motzkin-Rabin Theorem

**4**

**0**answers

### Ref. request: Enumerating elements of Bruhat cells

**2**

**1**answer

### How to estimate a summation?

**4**

**1**answer

### A set-family game

**3**

**0**answers

### How to compute the asymptotic of a summation which involves binomial coefficients?

**2**

**0**answers

### Largest number of sets $k$ among given $m$ sets that give union size lower than a given bound

**4**

**1**answer

### $Pr(A>B)$, where $A$ and $B$ are sum of Bernoullies

**1**

**0**answers

### Find a set of $N$ numbers s.t. all combination of $N$ on $X$ with repetition of $Y \leq X$ sum up to a different value

**1**

**1**answer

### Perfect Difference Set of order 7^2-7+1=43

**1**

**0**answers

### A partial ordering on $S_n$

**7**

**1**answer

### Higher dimensional scutoids?

**3**

**0**answers

### Hadwiger number of Erdös-Faber-Lovasz graphs

**0**

**0**answers

### Partitioning ordered objects into sets so as to maximize isolated objects

**32**

**2**answers

### How to find Erdős' treasure trove?

**2**

**0**answers

### Width of symmetric groups

**3**

**0**answers

### How rich is the class of vertex- and edge-transitive polytopes?

**3**

**1**answer

### What is the consistency strength of non-existence of outer automorphisms of Calkin algebra?

**2**

**1**answer

### Generalization: (The “number” of) smaller sized clusters in large random binary matrices follow a descending order. Why?

**3**

**2**answers