回复：can i ask question/? what is 变分法?

变分法是处理函数的函数的数学领域，和处理数的函数的普通微积分相对。譬如，这样的泛函可以通过未知函数的积分和它的导数来构造。变分法最终寻求的是极值函数：它们使得泛函取得极大或极小值。[source: wiki]

not familiar with pneumatic system.

As to hydraulic systems(Ocean, river, lake, estuery, groundwater), my impressions seem to be that they have their own versoins of simulators (sort of simplified versions of Navier Stokes solution).

Guess, Sigma can help you more.

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• 没学过，数学就学到了定积分. xiexie. -jennifer2007- ♀ (0 bytes) () 06/14/2009 postreply 19:08:42