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23 hours ago · The Royal Air Force (RAF) is the air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the First World War on 1 April 1918, becoming the second independent air force in the world after the Finnish Air Force (established 6 March 1918), by merging the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS).
23 hours ago · Poincaré's recurrence theorem: certain systems will, after a sufficiently long but finite time, return to a state very close to the initial state. Poincaré–Bendixson theorem: a statement about the long-term behaviour of orbits of continuous dynamical systems on the plane, cylinder, or two-sphere.
