Fire-farve Sætningen

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Fire-farve Sætningen JB Oversigt Historie Kort og Grafer Bevis ide Kempekæder Kempe’s bevis Kempe’s fejl Heawood’s modeksempel Heawood grafen 5-farve sætningen Birkhoff Birkhoff’s diamant C-reducerbarhed Konfigurationer og D-reducerbarhed Beviserne Afladning Forbedringer Ringstørrelsen Antal forskellige 4-farvninger af en k-ring 6 7 8 9 10 11 12 13 14 31 91 274 820 2461 7381 22144 64430 199291 χCk (x) = (x − 1)k + (−1) k (x − 1). Hvis mindst 3 farver bruges f˚as 24 ækvivalente. Hvis netop 2 farver bruges (kun muligt for k lige) f˚as 12 ækvivalente. Antal = χCk (4)/24 for k ulige 1 + (χCk (4) − 12)/24 for k lige
Fire-farve Sætningen JB Oversigt Historie Kort og Grafer Bevis ide Kempekæder Kempe’s bevis Kempe’s fejl Heawood’s modeksempel Heawood grafen 5-farve sætningen Birkhoff Birkhoff’s diamant C-reducerbarhed Konfigurationer og D-reducerbarhed Beviserne Afladning Forbedringer Ringstørrelsen Antal forskellige 4-farvninger af en k-ring 6 7 8 9 10 11 12 13 14 31 91 274 820 2461 7381 22144 64430 199291 χCk (x) = (x − 1)k + (−1) k (x − 1). Hvis mindst 3 farver bruges f˚as 24 ækvivalente. Hvis netop 2 farver bruges (kun muligt for k lige) f˚as 12 ækvivalente. Antal = χCk (4)/24 for k ulige 1 + (χCk (4) − 12)/24 for k lige
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Fire-farve Sætningen

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