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1 answer
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Maximum number of vectors with bounds on inner products (follow up question)

This is a follow-up question from my previous question. Suppose there are (2n+1) vectors $\{m_1,m_2,...,m_n\}$, $\{p_1,p_2,...,p_n\}$ and $p^*$ in $R^{k+1}$. $m_i$ are weakly positive vectors. $p_i$ ...
TanG's user avatar
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1 vote
1 answer
207 views

Maximum number of vectors with bounds on inner products

Suppose there are 2n vectors $\{m_1,m_2,...,m_n\}$ and $\{\mu_1,\mu_2,...,\mu_n\}$. All vectors are in k-dimensional Euclid space $R^k$. The vectors satisfy: $$m_i \mu_j \leq 0, \quad \forall i\neq j $...
TanG's user avatar
  • 23
1 vote
0 answers
107 views

Stronger condition than being a normal polytope?

A polytope $P$ with integer vertices is called normal if for every $p = \sum_j a_j p_j $ such that $a_j \geq 0$, $\sum_j a_j = k \in \mathbb{N}$, $p_j$ are vertices of $P$ and $p$ is an integer ...
Per Alexandersson's user avatar
6 votes
1 answer
395 views

Normal polytopes - counterexample?

An integral polytope $P$ is normal if all lattice points inside the integer dilation $kP$ can be expressed as $p_1+p_2+\dots+p_k$, where $p_i \in P$ are lattice points. I am looking for an example $P$...
Per Alexandersson's user avatar
23 votes
3 answers
3k views

How many different numbers can be obtained as product of first $n$ natural numbers?

Let m and n be natural numbers, and consider the set of all possible products of m (not necessarily distinct) elements from the set $\{1,2,\ldots,n\}$, that is consider the set $\{1^{a_1} \cdot 2^{...
Hujdurovic's user avatar