Planar Graph Theory and the Four Color Problem(Ⅲ)——Some Theoritical Results Derived from the Four Color Problem
Received:April 21, 1982  
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Liu Yanpei Institute of Applied Mathematics
Academia Sinica 
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      This is the third part of the series of five papers about planar graph theory and the four color problem.It contains the following five sections: §11 Heawood equations; §12 Hamiltonian planar graphs; §13 Hadwiger conjecture; §14 Chromatic critical graphs; §15Chromatic polynomials.
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