# Tesi etd-01142017-114422

Thesis type
Tesi di laurea magistrale
Author
PORQUEDDU, PIETRO
URN
etd-01142017-114422
Title
Gowers' Ramsey Theorem
Struttura
MATEMATICA
Corso di studi
MATEMATICA
Supervisors
relatore Prof. Di Nasso, Mauro
controrelatore Prof. Majer, Pietro
Parole chiave
• Gowers
• Ramsey theory
• combinatorics
• ultrafilter
Data inizio appello
03/02/2017;
Consultabilità
Completa
Riassunto analitico
In this thesis we give an overview of Gowers' combinatorial results for the set of maps $\text{FIN}_{k}^{\pm}$, and their generalisations. In the first chapter we introduce the theory of ultrafilters, which are our fundamental tool, and the basic notions about semigroups. The second chapter is the core of this work, here we present the notion of subsymmetric ultrafilters and we will use them to prove Gowers' theorems. In the third chapter, we will see briefly Gowers' original arguments. Finally, in the fourth chapter, we will see M. Lupini's recent results on generalised tetris operations.
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