Brouwer’s dissertation marked the beginning of two separate research activities that played an important role in the mathematics of the twentieth century. The first of these were his first steps in topology and Lie group theory, the second one opened up new directions in the foundations of mathematics. It is with the second one that we are concerned here; for the first one see Freudenthal’s comments in (Brouwer 1976).


Isosceles Triangle Temporal Attention Choice Sequence Unknown Point Complete Induction 
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Copyright information

© Birkhäuser Verlag AG 2008

Authors and Affiliations

  • Dirk van Dalen
    • 1
  1. 1.Department of PhilosophyUtrecht UniversityThe Netherlands

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