Research objectives: This article offers a source study and an edition of the missive Khan Safa Giray Kazan attached to letter King Poland Grand Duke Lithuania Sigismund Old (Zygmunt Stary) which he composent Council Lords Duchy on November 8, 1538. The research aims contextualize khan’s establish its date. materials: copies letters preserved in collection Ignacy Onacewicz Institute Russian Lit...

When Canada’s current political system was established in 1867, the Fathers of Confederation took pains to make Canada’s federal government conform as closely as possible to British practiceand to diverge as sharply as possible from the supposedly failed political system of the United States. As Britain was a unitary state and Canada was a federation like the United States, this proved a formi...

We study the European river Danube and the South American river Negro daily water levels. We present a fit for the Negro daily water level period and standard deviation. Unexpectedly, we discover that the river Negro and Danube are mirror rivers in the sense that the daily water levels fluctuations histograms are close to the BHP and reversed BHP, respectively.

We apply combinatorial arguments to establish structural constraints on Costas arrays. We prove restrictions on when a Costas array can contain a large corner region whose entries are all 0. In particular, we prove a 2010 conjecture due to Russo, Erickson and Beard. We then constrain the vectors joining pairs of 1s in a Costas array by establishing a series of results on its number of “mirror p...

In many parts of the world, and Japan was no exception, the 16th Century was a time of conflict and violence. In Japan, a number of feudal lords were embroiled in fierce battles for survival. The battles produced three victors who attempted, one after another, to unify Japan. The last of these was Ieyasu Tokugawa, who founded a “permanent” government which lasted for two and a half centuries be...

8Love never fails; but if there are gifts of prophecy, they will be done away; if there are tongues, they will cease; if there is knowledge, it will be done away. 9For we know in part and we prophesy in part; 10but when the perfect comes, the partial will be done away. 11When I was a child, I used to speak as a child, think as a child, reason as a child; when I became a man, I did away with chi...