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<Text-field style="Heading 1" layout="Normal">teorema das quatro cores,</Text-field>
<Text-field style="Text" layout="Normal"><Font italic="true">s.</Font><Font encoding="UTF-8"> o resultado de que qualquer mapa plano pode ser colorido utilizando no m\303\241ximo quatro cores de forma que n\303\243o exista duas \303\241reas adjacentes da mesma cor. Isso foi suposto no s\303\251culo XIX, repetidamente desaprovado e finalmente aprovado em 1976 pela combina\303\247\303\243o da teoria dos grafos e computa\303\247\303\243o sofisticada. Segue, ent\303\243o que \303\251 imposs\303\255vel adicionar uma quinta regi\303\243o ao primeiro diagrama abaixo de forma que todas as cinco regi\303\265es compartilhem uma fronteira com todas as outras; uma tentativa de faz\303\252-lo, por exemplo, adicionando a regi\303\243o branca no segundo diagrama, de fato remove uma das fronteiras originais e asssim permitiria que C fosse colorido da mesma forma que B.</Font></Text-field>
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