Avoiding and Enforcing Repetitive Structures in Words 53 Zuerst scheint es

Zuerst scheint es

Ökonomische Analyse des Ratings23

die sich speziell für den Handel mit Osteuropa eignen

or electric cars

Avoiding and Enforcing Repetitive Structures in Words 53 Zuerst scheint esAvoiding and enforcing repetitions in words are central topics in the area of combinatorics on words, with first results going back to the beginning of the 20th century. The results presented in this thesis extend and enrich the existing theory concerning the presence and absence of repetitive structures in words. In the first part the question whether such structures necessarily appear in infinite words over a finite alphabet is investigated. In