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The Ultra Low Emission Zone (ULEZ) is an area in London, England, where an emissions standard based charge is applied to non-compliant road vehicles. Plans were announced by London Mayor Boris Johnson in 2015 for the zone to come into operation in 2020.
The ULEZ, which went into effect on 8 April 2019, [32] initially covered the same area as the T-Charge but applies 24/7, 365 days a year, with charges of £12.50 a day for cars, vans and motorcycles, and £100 a day for lorries, buses and coaches.
Under the scheme, cars and vans that don't meet certain emissions standards (Euro 4 for petrol and Euro 6 for diesel) have to pay a £12.50 charge to drive into the Ulez zone. TfL says this means ...
3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.
For example, squares (resp. triangles) have 4 sides (resp. 3 sides); or compact (resp. Lindelöf) spaces are ones where every open cover has a finite (resp. countable) open subcover. sharp Often, a mathematical theorem will establish constraints on the behavior of some object; for example, a function will be shown to have an upper or lower bound.
In number theory, it has been used beginning with Carl Friedrich Gauss (who first used it with this meaning in 1801) to mean modular congruence: () if N divides a − b. [ 10 ] [ 11 ] In category theory , triple bars may be used to connect objects in a commutative diagram , indicating that they are actually the same object rather than being ...
For example, in Book I of Euclid's Elements, a line is defined as a "breadthless length" (Def. 2), while a straight line is defined as "a line that lies evenly with the points on itself" (Def. 4). Euclid's idea of a line is perhaps clarified by the statement "The extremities of a line are points," (Def. 3). [3] Later commentators further ...
Terms inside the bracket are evaluated first; hence 2×(3 + 4) is 14, 20 ÷ (5(1 + 1)) is 2 and (2×3) + 4 is 10. This notation is extended to cover more general algebra involving variables: for example (x + y) × (x − y). Square brackets are also often used in place of a second set of parentheses when they are nested—so as to provide a ...