Concepedia

K. I. Appel

KI

Statistics

Publications

16

Citations

3.5K

H-Index

13

Active since

1959

Affiliations

University of Illinois System(Current)

University of Illinois Urbana-Champaign

K. I. Appel is an author at University of Illinois System specializing in discrete mathematics, cartography, and education.

Top concepts

Publications per year

1959–1986

16

Publications

16

Every planar map is four colorable

K. I. Appel, Wolfgang Haken · Bulletin of the American Mathematical Society · 1976 · 1.1K citations · Full text

Every planar map is four colorable. Part I: Discharging

K. I. Appel, Wolfgang Haken · Illinois Journal of Mathematics · 1977 · 870 citations

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Every planar map is four colorable. Part II: Reducibility

K. I. Appel, Wolfgang Haken, J. Koch · Illinois Journal of Mathematics · 1977 · 701 citations · Full text

The Solution of the Four-Color-Map Problem

K. I. Appel, Wolfgang Haken · Scientific American · 1977 · 421 citations

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Artin groups and infinite Coxeter groups

K. I. Appel, Paul E. Schupp · Inventiones mathematicae · 1983 · 97 citations

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1–5 of 16