Four colour theorems: history topological foundations and idea of proof/

Eitemau Tebyg

• Four colour theorem
  gan: Fritsch, Rudolf
  Cyhoeddwyd: (1998)
• The four color theorem : history, topological foundations, and idea of proof /
  gan: Fritsch, Rudolf
  Cyhoeddwyd: (1998)
• The four color theorem : history, topological foundations, and idea of proof /
  gan: Fritsch, Rudolf, et al.
  Cyhoeddwyd: (1998)
• Complex proofs of real theorems /
  gan: Lax, Peter D.
  Cyhoeddwyd: (2012)
• Complex proofs of real theorems /
  gan: Lax, Peter D., et al.
  Cyhoeddwyd: (2012)