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  2. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    As an illustration of this, the parity cycle (1 1 0 0 1 1 0 0) and its sub-cycle (1 1 0 0) are associated to the same fraction ⁠ 5 / 7 ⁠ when reduced to lowest terms. In this context, assuming the validity of the Collatz conjecture implies that (1 0) and (0 1) are the only parity cycles generated by positive whole numbers (1 and 2 ...

  3. List of unsolved problems in mathematics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.

  4. X-Plane (simulator) - Wikipedia

    en.wikipedia.org/wiki/X-Plane_(simulator)

    X-Plane is a flight simulation software initially launched by Laminar Research in 1995. Commercial desktop versions are sold for macOS, Windows, and Linux. In addition, Laminar Research also distributes FAA-certified versions for professional use. A mobile version has been available for Android, iOS, and webOS since 2009 as well.

  5. List of X-planes - Wikipedia

    en.wikipedia.org/wiki/List_of_X-planes

    Later X-planes supported important research in a multitude of aerodynamic and technical fields, but only the North American X-15 rocket plane of the early 1960s achieved comparable fame to that of the X-1. [citation needed] X-planes 8, 9, 11, 12, and 17 were actually missiles [8] used to test new types of engines, and some other vehicles were ...

  6. Airbus A220 - Wikipedia

    en.wikipedia.org/wiki/Airbus_A220

    Since 2020, the Airbus A220 has also been available as a business jet (bizjet) under the name ACJ TwoTwenty, which is a variant of the A220-100 with a range of 5,650 nmi (10,460 km) and customisable cabin space of 73 m 2 (790 sq ft) for 18 passengers.

  7. I flew on JetBlue's brand-new Airbus A220 and saw why it's ...

    www.aol.com/flew-jetblues-brand-airbus-a220...

    JetBlue Airways is the latest US airline to fly the Airbus A220, a next-generation aircraft to replace the airline's Embraer E190s. The 140-seat aircraft is configured in a unique 2-3 arrangement ...

  8. List of Airbus A220 operators - Wikipedia

    en.wikipedia.org/wiki/List_of_Airbus_A220_operators

    As of February 2025, there are 396 A220 family aircraft in service with 20 commercial operators amongst other undisclosed operators. The five largest A220 operators are Delta Air Lines (75), airBaltic (50), JetBlue (44), Air France (41) and Breeze Airways (35).

  9. Laminar Research - Wikipedia

    en.wikipedia.org/wiki/Laminar_Research

    In May 2017, X-Plane 11 was released, a major iteration in their flight simulator. X-Plane 11 is available in both a consumer version, as well as a Federal Aviation Administration certifiable professional version. [5] In January 2022, Laminar Research announced the release of their upcoming next-generation simulation game, X-Plane 12. It is ...