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D and delta

by cheez
Tags: delta
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Feb14-07, 12:47 AM
P: 28
How come d becomes (delta)? after integration? I thought d and delta is the same thing. What's the difference between them?

For example,
dA = - PdV

After intergration, it becomes
(delta)A = -(integral)PdV

I can't type the symbols.

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Feb14-07, 04:05 PM
Sci Advisor
HW Helper
P: 25,228
If the integration is going say, from x0 to x1, then (delta)A is an abbreviation for A(x1)-A(x0). (integral)dA=A but applying the limits I get (delta)A. Not at all the same thing as the dA symbol.
Feb14-07, 04:19 PM
P: 312
Delta just means "change in" and is used for just plain change or average change, nothing instantaneous or infintesimal. With calculus, most of the deltas turn into d's, but not all as shown here

Oct29-10, 08:28 PM
P: 103
D and delta

I am having the same problem, if I take the entropy for example

We have (delta - the triangle)S=q/t
then we have dS=dq/T
and then there's partial derivatives

what is the difference between them?

If I integrate say the partial derivative of dq = q? or would that equal (delta)q?

Thank you

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