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**k**=[kx ky kz]

T=T(x,y,z)

Function I want:

div(k ? gradT) where "?" would be some operator that multiplies each component of

**k**and

**grad**T to make the vector [kx ∂T/dx , ky ∂T/∂y , kz ∂T/∂z]

that way I can apply the divergence operator and get:

∂/∂x (kx ∂T/∂x) + ∂/∂y (ky ∂T/∂y) + ∂/∂z (kz ∂T/∂z)

So is there some way to express this using elementary notation?