Brief History of IGS/DGS

The earliest Geometry Software?

The earliest IGS was the Geometric Supposer, which was developed in the early 1980s.
  • Schwartz; Yerushalmy and Wilson (1993). The Geometric Supposer: What is it a Case of?. Hillsdale, NJ: Lawrence Erlbaum Associates.

Interactive Geometry Software

  • Cabri (Jean-Marie Laborde, 1986-)
  • Cinderella (Jürgen Richter-Gebert and Ulrich Kortenkamp, 1998-)

Dynamic Geometry Software

Construction Tool? (作図ツール)

  • GC (Yasuyuki Iijima, 1989)