The four-color problem was first formulated in 1852 and was not proven until 1976.
四色问题在1852 年首次提出。
参考来源 - 构形可约性证明的DNA算法·2,447,543篇论文数据，部分数据来源于NoteExpress
This paper mainly discusses the problem of how to establish four - color mathematical model of Flexography.
本文主要研究了柔性版印刷四色呈色数学模型的建立问题。
This paper mainly discusses the problem of how to establish four-color mathematical model of Flexography.
本文主要研究了柔性版印刷四色呈色数学模型的建立问题。
It was also used by other mathematicians to make various forms of progress on the four color problem.
也有人用其他数学家，使各种形式的进展，就四个颜色的问题。
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