Ringel

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51	SOLUTION OF THE HEAWOOD MAP-COLORING PROBLEM* BY GERHARD RINGEL AND J. W. T. YOUNGS UNIVERSITY OF CALIFORNIA (SANTA CRUZ) Add to Reading List Source URL: www.ncbi.nlm.nih.gov Language: English Topological graph theory Conjectures Heawood conjecture Four color theorem Gerhard Ringel Torus Cayley graph Manifold Graph Graph theory Mathematics Graph coloring
52	jim mackenzie FLIGHTS of FANCY Add to Reading List Source URL: review.ucsc.edu Language: English - Date: 2006-09-29 14:49:51 Geography of California Graph coloring Discrete mathematics Ringel Lepidoptera University of California Santa Cruz Four color theorem Butterflies Santa Cruz California Mathematics Pollinators Gerhard Ringel
53	PDF Document Add to Reading List Source URL: review.ucsc.edu Language: English - Date: 2006-09-29 14:49:51 Geography of California Graph coloring Discrete mathematics Ringel Lepidoptera University of California Santa Cruz Four color theorem Butterflies Santa Cruz California Mathematics Pollinators Gerhard Ringel