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  2. Travel insurance - Wikipedia

    en.wikipedia.org/wiki/Travel_insurance

    Travel insurance is an insurance product for covering unforeseen losses incurred while travelling, either internationally or domestically. Basic policies generally only cover emergency medical expenses while overseas, while comprehensive policies typically include coverage for trip cancellation, lost luggage , flight delays , public liability ...

  3. Great-circle navigation - Wikipedia

    en.wikipedia.org/wiki/Great-circle_navigation

    If a navigator begins at P 1 = (φ 1,λ 1) and plans to travel the great circle to a point at point P 2 = (φ 2,λ 2) (see Fig. 1, φ is the latitude, positive northward, and λ is the longitude, positive eastward), the initial and final courses α 1 and α 2 are given by formulas for solving a spherical triangle

  4. Circle group - Wikipedia

    en.wikipedia.org/wiki/Circle_group

    Moreover, since the unit circle is a closed subset of the complex plane, the circle group is a closed subgroup of (itself regarded as a topological group). One can say even more. The circle is a 1-dimensional real manifold , and multiplication and inversion are real-analytic maps on the circle.

  5. Covering group - Wikipedia

    en.wikipedia.org/wiki/Covering_group

    The universal covering group of the circle group T is the additive group of real numbers (R, +) with the covering homomorphism given by the mapping R → T : x ↦ exp(2πix). The kernel of this mapping is isomorphic to Z. For any integer n we have a covering group of the circle by itself T → T that sends z to z n.

  6. Trump aims to deport all immigrants in the US illegally - AOL

    www.aol.com/news/trump-says-aims-deport...

    By Ted Hesson. WASHINGTON (Reuters) -U.S. President-elect Donald Trump aims to deport all immigrants in the U.S. illegally over his four-year term but wants a deal to protect so-called "Dreamer ...

  7. Dubins path - Wikipedia

    en.wikipedia.org/wiki/Dubins_path

    In geometry, the term Dubins path typically refers to the shortest curve that connects two points in the two-dimensional Euclidean plane (i.e. x-y plane) with a constraint on the curvature of the path and with prescribed initial and terminal tangents to the path, and an assumption that the vehicle traveling the path can only travel forward.

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