1. Another approach to proof: Arguments from physics

   • Gila Hanna
   • Hans Niels Jahnke

   Analyses Pages: 1 - 8

2. Informal prerequisites for informal proofs

   • Aiso Heinze
   • Jee Yi Kwak

   Analyses Pages: 9 - 16

3. Defining a rectangle under a social and practical setting by two seventh graders

   • Fou-Lai Lin
   • Kai-Lin Yang

   Analyses Pages: 17 - 28

4. Learning to prove: The idea of heuristic examples

   • Kristina Reiss
   • Alexander Renkl

   Analyses Pages: 29 - 35