nonlinear instability
41Monte Carlo method — Not to be confused with Monte Carlo algorithm. Computational physics …
42Computational fluid dynamics — Computational physics Numerical analysis  …
43Equipartition theorem — [ Thermal motion of an α helical peptide. The jittery motion is random and complex, and the energy of any particular atom can fluctuate wildly. Nevertheless, the equipartition theorem allows the average kinetic energy of each atom to be computed …
44Aleksandr Gurevich — Aleksandr Viktorovich Gurevich ( ru. Александр Викторович Гуревич) (b. September 19 1930 [ru icon [http://ufn.ru/ufn2000/ufn00 11/Russian/rper0011a.pdf Aleksandr Viktorovich Gurevich] article in Uspekhi Fizicheskikh Nauk on his 70th anniversary]… …
45Eigenvalue, eigenvector and eigenspace — In mathematics, given a linear transformation, an Audio|De eigenvector.ogg|eigenvector of that linear transformation is a nonzero vector which, when that transformation is applied to it, changes in length, but not direction. For each eigenvector… …
46PID controller — A block diagram of a PID controller A proportional–integral–derivative controller (PID controller) is a generic control loop feedback mechanism (controller) widely used in industrial control systems – a PID is the most commonly used feedback… …
47Analog sound vs. digital sound — Analog sound versus digital sound compares the two ways in which sound is recorded and stored. Actual sound waves consist of continuous variations in air pressure. Representations of these signals can be recorded in either digital or analog… …
48Correlation — In probability theory and statistics, correlation, (often measured as a correlation coefficient), indicates the strength and direction of a linear relationship between two random variables. In general statistical usage, correlation or co relation …
49Paul Samuelson — Paul A. Samuelson Neo Keynesian economics Photo taken 1950 (age 35) Born May 15, 1915(1915 05 15) Gary …
50Galloping Gertie — This article is about the first Tacoma Narrows Bridge, which collapsed in 1940. For the article on the current bridge, see Tacoma Narrows Bridge. Infobox Bridge bridge name = Tacoma Narrows Bridge (Galloping Gertie) caption = The first Tacoma… …
