London's Air Ambulance its second MD 902, registration G-LNDN. Built in 2008, the aircraft was previously registered in Qatar as A7-NHA. In addition to the standard livery, it bears the masonic Square and Compasses symbol on each side, with the words "London Freemasons" lettered under the doors, to reflect the significant funding from the organisation. At night or when the helicopters are offline the medical crew, including a paramedic and senior trauma doctor, still respond to emergencies, but travel in a specially equipped rapid response car. The six cars, Škoda Octavias and also Škoda Superbs, occasionally operate during the day, carrying backup medical
G-structure on a manifold condition. Without the corresponding integrability condition, the structure is instead called an "almost" structure, as in an almost complex structure, an almost symplectic structure, or an almost Kähler structure. Specifically, a symplectic manifold structure is a stronger concept than a "G"-structure for the symplectic group. A symplectic structure on a manifold is a two-form "ω" on "M" that is non-degenerate (which is an formula_38-structure, or almost symplectic structure), "together with" the extra condition that d"ω" = 0; this latter is called an integrability condition. Similarly, foliations correspond to "G"-structures coming from block matrices, together with integrability conditions so that the