The oscillation for a second order neutral difference equations with "maxima" 2 xn+pnxn k qn× max s n l, n rsxs=0 and 2 xn+pnxn k qns mn al,x n f xs k 1 , , xs k m =0 is studied.

Consider a class of neutral difference equation with !maxima", some results for the asymptotical properties of all non-oscillatory solutions of the equation are obtained, that is, sufficient conditions for all non-oscillatory solutions {x-n} satisfying {lim}n→∞ x-n=0 or {lim}n→∞｜x-n｜=∞ are obtained, which extend the corresponding results of the references.

Analysis of large projects investment decision based on entropy-weight theory;

Because Yibin city s investment in the key projects has account for a great of proportion in its fixed asset investment, so the key projects have an important support function and bring an important contribution to host regional economic GDP.

Through a discussion on the suffix features of miniterm and maxiterm,this paper offers a suffix calculating approach to miniterm and maxiterm in principal disjunctive normal form,principal conjunctive normal form determined by disjunctive normal form,and conjunctive normal form of propositional formula.