- continuous function (topology)
- 函: case; envelope
- 拓: open up; develop; expand
- 拓: 拓动词(把碑刻、铜器等的形状和上面的文字、图形印下来; 拓印) make rubbings from inscriptions, pictures, etc. on stone tablets or bronze vessels
- 函: 名词1.[书面语] (匣; 封套) case; envelope 镜函 a case for a mirror2.(信件) letter 公函 official letter; 函复 reply by letter; write a letter in reply; 函告 inform by letter; 来函 incoming letters; 索赔函 claim letter3.(姓氏) a surname 函熙 han xi
- 【拓】上积。: cup product
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