The proof is based on an energyinequality and the density of the range of the operator generated by the studied problem.
本文研究高阶复合方程基于能量不等式和生成算子的稠密性。
2
Russia's economy would fall off a cliff if energy prices slumped and its population, racked by ill-health and inequality, is shrinking by up to 800, 000 a year.