What are the assumptions about a marginal rate of substation of the first (second) production factor by the second (first) production factors in a vector X = (x₁, x₂) G of production factors' inputs where G = 

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{ x = R | (x) = yo = const. >0} C R by which a CES production func- tion f(x, x2) = (ax1 + ax2), a > 0, i = 1,2, y e (-0; 0) u (0; 1) positively homogenous of first degree is convergent to a: linear, Cobb-Douglas, Koopmans-Leontief function?