MathSciNet bibliographic data MR1200205 58C25 (30G35) Waterhouse, William C. Differentiable functions on algebras and the equation ${\rm grad}(w)=M{\rm grad}(v)$${\rm grad}(w)=M{\rm grad}(v)$. Proc. Roy. Soc. Edinburgh Sect. A 122 (1992), no. 3-4, 353–361. Article

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