Talk:Nonlinear finite elements/Weak form of heat equation

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Shouldn't it be instead of ? ( is the heat capacity at constant pressure while is at constant volume. I assume the two dependent variables are pressure and temperature here, not volume and temperature. (The preceding unsigned comment was added by (talkcontribs) 30 April 2013)

Hello, I'd strongly suggest using different notation for vectors (vector functions) and tensors. I assume kappa to be a tensor. Otherwise the first identity cannot be applied to eq. 29. Changing notation would make the example way more readable. Furthermore, Eq. 30 does not constitute a substitution but rather integration over in . Substitution takes place later, in Eq. 33. (The preceding unsigned comment was added by (talkcontribs) 20 November 2015‎)