The Milnor Problem (modified) in the theory of group growth asks whether any finite presented vanishing algebraic entropy has at most polynomial growth. We show that a positive answer to is equivalent Nilpotency Conjecture Riemannian geometry: given $n, d>0$, there exists constant $\epsilon(n,d)>0$ such if compact $n$-manifold $M$ satisfies Ricci curvature $\op{Ric}_M\ge -(n-1)$, diameter $d\ge...

in the classical data envelopment analysis (dea) models, inputs and outputs are assumed as known variables, and these models cannot deal with unknown amounts of variables directly. in recent years, there are few researches on handling missing data. this paper suggests a new interval based approach to apply missing data, which is the modified version of kousmanen (2009) approach. first, the prop...