ES// = — ^ f ' + ¿S// + (S//)cor E S/// = f f + ¿S/// + (S///)C
ES/V = (S/V )Teï + (S/V ) cor The equivalent condition of (4.72) is then
We will suppose that is small compared with 2EAS/-/. Setting E
f '/g from (4.34), Eq. (4.76) can be written approximately as
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