2012 was named as “the first year of Fresh Electronic Commerce” in China. Then the Electronic Commerce of fresh and fresh home delivery obtained rapid development. Although the development speed of fresh home delivery is fast, it still could not meet the demand of Fresh Electronic Commerce. The aim of this paper is to analyze the current situation of development of “the last mile” of Chinese fr...

In [8], Shelah and Stanley constructed a κ-Aronszjan tree with an ascent path using κ. We show that κ,2 does not imply the existence of Aronszajn trees with ascent paths. The proof goes through an intermediate combinatorial principle, which we investigate further.

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The Mediterranean, northeastern Atlantic, and inland freshwaters of Europe and the Ponto-Caspian region host a distinct fauna of gobiiform fishes, including the sand gobies (Pomatoschistus Gill and related genera), all of which have been classified in the most diverse goby group, the family Gobiidae. Recent molecular phylogenetic analyses have suggested that the sand gobies are not gobiids, and...