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Every planar map is four colorable

Every planar map is four colorable
Paper図書
Kenneth Appel and Wolfgang HakenAmerican Mathematical Societyc1989
Other Libraries in Japan
  • Author HeadingAppel, Kenneth I. Haken, W. (Wolfgang)

Contributions to group theory pbk. : alk. paper

Contributions to group theory pbk. : alk. paper
Paper図書
Kenneth I. Appel, John G. Ratcliffe and Paul E. Schupp, editorsAmerican Mathematical Societyc1984
Other Libraries in Japan
  • Author HeadingAppel, Kenneth I. Ratcliffe, John G. Schupp, Pa...

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