The 30-year history of quasicrystals is one in which, time after time, the conventional scientific view about what is possible has been proven wrong. First, quasicrystals were thought to be mathematically impossible; then, physically impossible; then, impossible unless synthesised in the laboratory under carefully controlled conditions. One by one, these strongly held views have been disproven,...

This paper studies the role of transfers among groups within a country as well as among countries in a two level game of international trade negotiations. We show that in order to realize the intended transfer in the presence of asymmetric information on the states of recipients (and donors), a transfer process uses up additional resources. The difficulty of making transfers renders it less lik...

In this commentary, I explore two questions raised by Angelotta and Appelbaum's study. First, I offer an English legal perspective on the protection of children from their mothers, looking at both civil (family) and criminal law. Second, I discuss the idealization of motherhood that is implied by the prosecution of pregnant women; the denigration of those who fail this ideal; and the way that i...

The construction of multivariate distributions is an active field of research in theoretical and applied statistics. In this paper some recent developments in this field are reviewed. Specifically, we study and review the following set of methods: (a) Construction of multivariate distributions based on order statistics, (b) Methods based on mixtures, (c) Conditionally specified distributions, (...

hans kelsen is one of the most famous legal philosophers in the entire world that his legal thoughts have always been drawing attention and critics. pure theory of law, unity of law system and logic of law system are his the most famous theories . in this article, we put forward these theories and challenge them.