2 Polygonal Dissections Dissection and reassembly

  title={2 Polygonal Dissections Dissection and reassembly},
  author={Anders Kaseorg},
What is a set? In the late 19th century, Georg Cantor was the first to formally investigate this question, thus founding the study of set theory as a mathematical discipline. Cantor’s definition of a set consisted of two intuitive principles. The first, Extensionality, asserts that two sets are equal exactly when they have the same members; the second… CONTINUE READING