The work *History of Arizona* by Thomas Edwin Farish is a comprehensive historical study of the development of the state of Arizona from ancient times to the early 20th century. The book provides a detailed account of the pre-colonial periods of the...
The Chernoff approximation method is a powerful and flexible tool of functional analysis, which allows in many cases to express exp(tL) in terms of variable coefficients of a linear differential operator L. In this paper, we prove a theorem that...