Divisibility of sum of multinomialsInteger-valued factorial ratiosPerron number distributionDesign constraint systems over the realsOn “The Average Height of Planted Plane Trees” by Knuth, de Bruijn and Rice (1972)Montgomery's conjecture and lower bound on certain Fourier transform.Distribution of the evaluation (at a non-trivial root of -1) of polynomials with small coefficientsCombinatorialProbabilistic Proof of Stirling's ApproximationGeneralizing Kasteleyn's formula even more?Derive a theoretical bound about coding with a partial eavesdropperTartaglia distribution
Divisibility of sum of multinomials
Integer-valued factorial ratiosPerron number distributionDesign constraint systems over the realsOn “The Average Height of Planted Plane Trees” by Knuth, de Bruijn and Rice (1972)Montgomery's conjecture and lower bound on certain Fourier transform.Distribution of the evaluation (at a non-trivial root of -1) of polynomials with small coefficientsCombinatorialProbabilistic Proof of Stirling's ApproximationGeneralizing Kasteleyn's formula even more?Derive a theoretical bound about coding with a partial eavesdropperTartaglia distribution
$begingroup$
Let $n, m$ and $t$ be positive integers. Define the multi-family of sequences
$$S(n,m,t)=sum_k_1+cdots+k_n=mbinommk_1,dots,k_n^t$$
where the sum runs over non-negative integers $k_1,dots,k_n$. These numbers are related to average distances (from the origin) of uniform unit-step random walks on the plane.
QUESTION. Is it always true that $n$ divides $S(n,m,t)$?
Observe that $S(n,m,1)=n^m$.
nt.number-theory co.combinatorics soft-question
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
$endgroup$
add a comment |
$begingroup$
Let $n, m$ and $t$ be positive integers. Define the multi-family of sequences
$$S(n,m,t)=sum_k_1+cdots+k_n=mbinommk_1,dots,k_n^t$$
where the sum runs over non-negative integers $k_1,dots,k_n$. These numbers are related to average distances (from the origin) of uniform unit-step random walks on the plane.
QUESTION. Is it always true that $n$ divides $S(n,m,t)$?
Observe that $S(n,m,1)=n^m$.
nt.number-theory co.combinatorics soft-question
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
$endgroup$
add a comment |
$begingroup$
Let $n, m$ and $t$ be positive integers. Define the multi-family of sequences
$$S(n,m,t)=sum_k_1+cdots+k_n=mbinommk_1,dots,k_n^t$$
where the sum runs over non-negative integers $k_1,dots,k_n$. These numbers are related to average distances (from the origin) of uniform unit-step random walks on the plane.
QUESTION. Is it always true that $n$ divides $S(n,m,t)$?
Observe that $S(n,m,1)=n^m$.
nt.number-theory co.combinatorics soft-question
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
$endgroup$
Let $n, m$ and $t$ be positive integers. Define the multi-family of sequences
$$S(n,m,t)=sum_k_1+cdots+k_n=mbinommk_1,dots,k_n^t$$
where the sum runs over non-negative integers $k_1,dots,k_n$. These numbers are related to average distances (from the origin) of uniform unit-step random walks on the plane.
QUESTION. Is it always true that $n$ divides $S(n,m,t)$?
Observe that $S(n,m,1)=n^m$.
nt.number-theory co.combinatorics soft-question
nt.number-theory co.combinatorics soft-question
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
edited 16 hours ago
T. Amdeberhan
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
asked 17 hours ago
T. AmdeberhanT. Amdeberhan
18.3k229132
18.3k229132
add a comment |
add a comment |
1 Answer
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$begingroup$
We count the number of $t$-tuples $(xi_1,ldots,xi_t)$ of the colorings of $1,ldots,m$ with $n$ given colors, for which any two colorings use the same multisets of colors. If $M$ is the number of such tuples in which 1 is colored red in the coloring $xi_1$ (red is one of our $n$ colors), the total number of $t$-tuples equals $ncdot M$.
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
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1 Answer
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$begingroup$
We count the number of $t$-tuples $(xi_1,ldots,xi_t)$ of the colorings of $1,ldots,m$ with $n$ given colors, for which any two colorings use the same multisets of colors. If $M$ is the number of such tuples in which 1 is colored red in the coloring $xi_1$ (red is one of our $n$ colors), the total number of $t$-tuples equals $ncdot M$.
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
$endgroup$
add a comment |
$begingroup$
We count the number of $t$-tuples $(xi_1,ldots,xi_t)$ of the colorings of $1,ldots,m$ with $n$ given colors, for which any two colorings use the same multisets of colors. If $M$ is the number of such tuples in which 1 is colored red in the coloring $xi_1$ (red is one of our $n$ colors), the total number of $t$-tuples equals $ncdot M$.
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
$endgroup$
add a comment |
$begingroup$
We count the number of $t$-tuples $(xi_1,ldots,xi_t)$ of the colorings of $1,ldots,m$ with $n$ given colors, for which any two colorings use the same multisets of colors. If $M$ is the number of such tuples in which 1 is colored red in the coloring $xi_1$ (red is one of our $n$ colors), the total number of $t$-tuples equals $ncdot M$.
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
$endgroup$
We count the number of $t$-tuples $(xi_1,ldots,xi_t)$ of the colorings of $1,ldots,m$ with $n$ given colors, for which any two colorings use the same multisets of colors. If $M$ is the number of such tuples in which 1 is colored red in the coloring $xi_1$ (red is one of our $n$ colors), the total number of $t$-tuples equals $ncdot M$.
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
answered 16 hours ago
Fedor PetrovFedor Petrov
52k6122239
52k6122239
add a comment |
add a comment |
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