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Multi-affine function

Suppose i have a three-variable function f(x1,x2,x3), f:R^3 -> R. If it is linear for x1,x2 and x3 we can say it has the form f(x1,x2,x3) = c1x1 + c2x2 + c3x3 where c1,c2,c3 in R. We can ...