回複：can i ask question/? what is 變分法?

變分法是處理函數的函數的數學領域，和處理數的函數的普通微積分相對。譬如，這樣的泛函可以通過未知函數的積分和它的導數來構造。變分法最終尋求的是極值函數：它們使得泛函取得極大或極小值。[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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• 沒學過，數學就學到了定積分. xiexie. -jennifer2007- ♀ (0 bytes) () 06/14/2009 postreply 19:08:42