It comes from the study of the celebrated four color problem.
它起源于四色问题的研究。
参考来源 - 若干图类的全染色、完备染色和选色问题研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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。
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。
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