Prolation Prolation Prolation is a term used in the theory of the mensural notation of medieval and Renaissance music to describe its rhythmic structure on a small scale, as opposed to "tempus", which described a larger scale. The term "prolation" is derived from the Latin "prolatio", first used by Philippe de Vitry in describing Ars Nova, a musical style that came about in 14th-century France. Prolation, together with tempus, corresponds roughly to the concept of time signature in modern music. Prolation describes whether a semibreve (whole note) is equal in length to two minims (half notes) ("minor prolation" or "imperfect prolation";
Time value of money on time value, and provides a simple introduction before considering more complicated and less familiar situations. This exposition follows . The fundamental change that the differential equation perspective brings is that, rather than computing a "number" (the present value "now"), one computes a "function" (the present value now or at any point in "future"). This function may then be analyzed—how does its value change over time—or compared with other functions. Formally, the statement that "value decreases over time" is given by defining the linear differential operator formula_37 as: This states that values decreases (−) over time (∂) at the discount