This is called a colour proof and the progress of making it is proofing or proving.
这份样图便称作彩色校样，而制作这种彩色校样的作业便称作打样或试印。
Additionally, the well-known four colour problem and elementary geometry theorem-proving problem have been discussed.
同时，也对四色问题与初等几何定理证明作了简单的讨论。
Additionally, the well-known four colour problem and elementary geometry theorem-proving problem have been discussed.
同时，也对四色问题与初等几何定理证明作了简单的讨论。
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