Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An asymptotically tight lower bound for superpatterns with small
  alphabets   A permutation $\sigma \in S_n$ is a $k$-superpattern (or $k$-universal) if it
contains each $\tau \in S_k$ as a pattern. This notion of "superpatterns" can
be generalized to words on smaller alphabets, and several questions about
superpatterns on small alphabets have recently been raised in the survey of
Engen and Vatter. One of these questions concerned the length of the shortest
$k$-superpattern on $[k+1]$. A construction by Miller gave an upper bound of
$(k^2+k)/2$, which we show is optimal up to lower-order terms. This implies a
weaker version of a conjecture by Eriksson, Eriksson, Linusson and Wastlund.
Our results also refute a 40-year-old conjecture of Gupta.

21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ