see this graph:

Image

Leibniz's notation shows that he had better understanding the concept.

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哈哈,流体的用欧拉的,固体的用拉格朗日的多 -zaocha2002- 给 zaocha2002 发送悄悄话 zaocha2002 的博客首页 (0 bytes) () 06/10/2025 postreply 12:31:15

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