make+tractable
121Gauge theory — For a generally accessible and less technical introduction to the topic, see Introduction to gauge theory. In physics, a gauge theory is a type of field theory in which the Lagrangian is invariant under a continuous group of local transformations …
122Torpedo Data Computer — The Torpedo Data Computer (TDC) was an early electromechanical analog computer used for torpedo fire control on American submarines during World War II (see Figure 1). Britain, Germany, and Japan also developed automated torpedo fire control… …
123Mixture model — See also: Mixture distribution In statistics, a mixture model is a probabilistic model for representing the presence of sub populations within an overall population, without requiring that an observed data set should identify the sub population… …
124Mass balance — A mass balance (also called a material balance) is an application of conservation of mass to the analysis of physical systems. By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown,… …
125Cross-figure — A cross figure (also variously called cross number puzzle or figure logic) is a puzzle similar to a crossword in structure, but with entries which consist of numbers rather than words, with individual digits being entered in the blank cells. The… …
126Operation Perch — Coordinates: 49°05′N 0°39′W / 49.083°N 0.65°W / 49.083; 0.65 …
127gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …
128Calendar of 1997 — ▪ 1998 JANUARY JANUARY 1 Ghanaian Kofi Annan replaces Egyptian Boutros Boutros Ghali in the position of United Nations secretary general. Among those knighted by Queen Elizabeth II in the annual New Year s Day ceremony is pop musician …
