The object of the investigation is to study reducible $M$-ideals in Banach spaces. It is shown that if the number of $M$-ideals in a Banach space $X$ is $n(<infty)$, then the number of reducible $M$-ideals does not exceed of $frac{(n-2)(n-3)}{2}$. Moreover, given a compact metric space $X$, we obtain a general form of a reducible $M$-ideal in the space $C(X)$ of continuous functions on $X$. The...

To study global and regional environment protection sustainable development also to optimize mapping methods, it is of great significance compare three existing 10 m resolution land cover products in terms accuracy: FROM-GLC10, the ESRI 2020 product (ESRI2020), European Space Agency world (ESA2020). However, most previous validations lack field collection points large regions, especially Southe...