21 questions linked to/from Symbols of derivatives
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### What is the difference in the two notation? [duplicate]

I have read in Zeemansky's physics $dQ=dU+pdV$ for first law of thermodynamics But when I came across another book of thermal physics,it says $δQ= dU +pdV$. So what us the difference ?
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### Use of infinitesimals in physics [duplicate]

I want to ask about infinitesimals and non-standard analysis. In physics we always use $\mathrm dx,~\mathrm dv,~\mathrm dt$ etc. as infinitesimal quantities. When we deduce equations in physics, when ...
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### Meaning the symbol, $W$ and $dW$

What's the difference between $W$ and $dW$? They are both work done and have similar formulae (same dimension). But I don't know the difference between them. $dW$ here ISN'T power.
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### Partial derivatives vs total derivatives in thermodynamics

The specific heat of a system is defined as $$C_z = T \left( \frac{\partial S}{\partial T} \right)_{z=\text{const}}$$ Sometimes however, I find the same definition, but with total derivatives ...
### Trying to understand the difference between $\Delta t$ and $dt$ [duplicate]
I'm trying to gain a more conceptual understanding of derivatives and would appreciate your feedback on this. Say I have a quantity, $x$, at time $t$. Now $x$ moves to a different location $x'$ in ...