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Gibbs (1889, p. 140): $$ \frac{d\,\log\mathrm V}{d\,\log p} = - \frac{d\,\log n}{d\,\log\lambda}. $$Legendre (1826, p. 466): $$ \frac{d\,l\,\Gamma a}{da} + \frac{d\,l\,\Gamma(\frac12+ a)}{d(\frac12+ a)} - \frac{2d\,l\,\Gamma(2a)}{d(2a)} = -2l\,2. $$