dual-level
21Dual gauge — Track gauge by size Broad gauge Sta …
22Dual-code rugby internationals — A dual code rugby international is a rugby footballer who has represented a country (or more rarely, two countries) at the international level in both rugby union and rugby league.Rugby league started as a breakaway version of rugby union in… …
23Dual purpose gun — The Mark 37 Model 6 5 inch dual purpose gun on display at the National Museum of the Pacific War. The gun had a range of over 6 miles and could fire 22 rounds a minute. A dual purpose gun is a naval artillery mounting designed to engage both… …
24Dual space — In mathematics, any vector space, V, has a corresponding dual vector space (or just dual space for short) consisting of all linear functionals on V. Dual vector spaces defined on finite dimensional vector spaces can be used for defining tensors… …
25Dual carriageway — A typical British dual carriageway with central barrier on the A63(T) near Hull, England …
26Dual power — Part of a series on Libertarian socialism …
27Dual education system — A dual education system combines apprenticeships in a company and vocational education at a vocational school in one course. This system is practiced in several countries, notably Germany, Austria, Bosnia and Herzegovina, Croatia, Serbia,… …
28Dual income tax — The dual income tax system levies a proportional tax rate on all net income (capital, wage and pension income less deductions) combined with progressive tax rates on gross labour and pension income. This implies that labour income is taxed at… …
29Dual clutch transmission — Transmission types Manual Sequential manual Non synchronous Preselector Automatic Manumatic Semi automatic Electrohydraulic …
30Dual problem — In constrained optimization, it is often possible to convert the primal problem (i.e. the original form of the optimization problem) to a dual form, which is termed a dual problem. Usually dual problem refers to the Lagrangian dual problem but… …
