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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 231.66

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2:51 PM EST

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To: andreas_wonisch who wrote (32682)	3/22/2001 6:36:22 AM
From: fyodor_	Read Replies (2) of 275872

Andreas: Are you sure? I never saw them outside variation calculus. Maybe you could provide an example? I'm not sure what you mean by "variation calculus", so I wouldn't be surprised if this is the other side of the same coin (and we thus agree completely). A lowercase delta is often used as a short form of "differentiation with respect to x" (usually written as a normal d with subscript x). I.e. the use delta avoids having to specify the variable which you are differentiating. You can probably find this in pretty much any maths book on partial differential equations. One quick example would be one I have on my shelf for reference "Advanced Engineering Mathematics" by Erwin Kreyszig. Another example (which can also be found in the aforementioned book, btw) is writing out something like the Laplacian operator. An example in two dimensions: delta² u delta² u ----------- + ---------- = 0 delta x² delta y² -fyo

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