This book addresses the mathematical rationality contained in the making of string figures. It does so by using interdisciplinary methods borrowed from anthropology, mathematics, history and philosophy of mathematics. The practice of string figure-making has long been carried out in many societies, and particularly in those of oral tradition. It consists in applying a succession of operations to a string (knotted into a loop), mostly using the fingers and sometimes the feet, the wrists or the mouth. This succession of operations is intended to generate a final figure. The book explores different modes of conceptualization of the practice of string figure-making and analyses various source material through these conceptual tools: it looks at research by mathematicians, as well as ethnographical publications, and personal fieldwork findings in the Chaco, Paraguay, and in the Trobriand Islands, Papua New Guinea, which all give evidence of the rationality that underlies this activity. It concludes that the creation of string figures may be seen as the result of intellectual processes, involving the elaboration of algorithms, and concepts such as operation, sub-procedure, iteration, and transformation.

Auteur

Eric Vandendriessche has obtained the French "Agrégation" of mathematics (1992). In 2010, he received his Ph.D. in History and Philosophy of Sciences from Paris Diderot University. Eric Vandendriessche is a member of the SciencesPhilosophyHistory French laboratory (UMR SPHERE 7219 CNRS & Paris Diderot University). He is currently carrying out research in ethnomathematics, doing fieldwork in Papua New Guinea and Vanuatu (Melanesia, South Pacific). The aim of his work is to study the mathematical rationality that underlies activities involving geometrical and algorithmic practices (such as string figure-making or sand-drawing in Oceania), while attempting to analyze how the practitioners of these activities conceive - or have conceived - them in societies of oral tradition. Eric vandendriessche is in charge of the "String figures: cultural and cognitive aspects of a mathematical practice" research program (20122015), financially supported by the city of Paris (program "Emergences" 2011).

Contenu

PART I: HOW TO STUDY STRING FIGURE-MAKING.- Chapter 1: String Figures and Ethnography.- Chapter 2: A Conceptualization of String Figure-Making.- PART II: MATHEMATICS AND STRING FIGURES.- Chapter 3: W.W. Rouse Ball's Mathematical Approach to String Figures.- Chapter 4: Thomas Storer and the Concept of Heart-Sequence.- PART III: ANALYSING STRING FIGURE ALGORITHMS.- Chapter 5: Heart-Sequences and "Look-alike" String Figures.- Chapter 6: Understanding Transformations.- PART IV: STRING FIGURES IN THE FIELD.- Chapter 7: Cultural and Cognitive Aspects of String Figure-Making in Two Different Societies.- Chapter 8: Comparison of the Trobriander and Guarani-Nandeva String Figure Corpora.- Chapter 9: Conclusion.- References.- Annexes.