# Permutations destroying arithmetic progressions in finite cyclic groups Artikel i vetenskaplig tidskrift, 2015

A permutation \pi of an abelian group G is said to destroy arithmetic progressions (APs) if, whenever (a,b,c) is a non-trivial 3-term AP in G, that is c-b=b-a and a,b,c are not all equal, then (\pi(a),\pi(b),\pi(c)) is not an AP. In a paper from 2004, the first author conjectured that such a permutation exists of Z/nZ, for all n except 2,3,5 and 7. Here we prove, as a special case of a more general result, that such a permutation exists for all n >= n_0, for some explcitly constructed number n_0 \approx 1.4 x 10^{14}. We also construct such a permutation of Z/pZ for all primes p > 3 such that p = 3 (mod 8).

arithmetic progression

Permutation

finite cyclic group

## Författare

#### Peter Hegarty

Göteborgs universitet

Chalmers, Matematiska vetenskaper, Matematik

#### Anders Martinsson

Göteborgs universitet

Chalmers, Matematiska vetenskaper, Matematik

#### Electronic Journal of Combinatorics

1097-1440 (ISSN) 1077-8926 (eISSN)

Vol. 22 4 Art. no. P4.39-

#### Fundament

Grundläggande vetenskaper

#### Ämneskategorier

Diskret matematik

2017-10-07