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  2. Einstein problem - Wikipedia

    en.wikipedia.org/wiki/Einstein_problem

    Alternatively, an undecorated tile with no matching rules may be constructed, but the tile is not connected. The construction can be extended to a three-dimensional, connected tile with no matching rules, but this tile allows tilings that are periodic in one direction, and so it is only weakly aperiodic. Moreover, the tile is not simply connected.

  3. Euclidean tilings by convex regular polygons - Wikipedia

    en.wikipedia.org/wiki/Euclidean_tilings_by...

    Following Grünbaum and Shephard (section 1.3), a tiling is said to be regular if the symmetry group of the tiling acts transitively on the flags of the tiling, where a flag is a triple consisting of a mutually incident vertex, edge and tile of the tiling. This means that, for every pair of flags, there is a symmetry operation mapping the first ...

  4. Socolar–Taylor tile - Wikipedia

    en.wikipedia.org/wiki/Socolar–Taylor_tile

    A patch of 25 monotiles, showing the triangular hierarchical structure. The Socolar–Taylor tile is a single non-connected tile which is aperiodic on the Euclidean plane, meaning that it admits only non-periodic tilings of the plane (due to the Sierpinski's triangle-like tiling that occurs), with rotations and reflections of the tile allowed. [1]

  5. 15 puzzle - Wikipedia

    en.wikipedia.org/wiki/15_puzzle

    The multi-tile metric counts subsequent moves of the empty tile in the same direction as one. [6] The number of possible positions of the 24 puzzle is ⁠ 25! / 2 ⁠ ≈ 7.76 × 10 24, which is too many to calculate God's number feasibly using brute-force methods. In 2011, lower bounds of 152 single-tile moves or 41 multi-tile moves had been ...

  6. List of Euclidean uniform tilings - Wikipedia

    en.wikipedia.org/wiki/List_of_euclidean_uniform...

    The Laves tilings have vertices at the centers of the regular polygons, and edges connecting centers of regular polygons that share an edge. The tiles of the Laves tilings are called planigons. This includes the 3 regular tiles (triangle, square and hexagon) and 8 irregular ones. [4] Each vertex has edges evenly spaced around it.

  7. The best Bluetooth trackers for finding lost stuff in 2025 ...

    www.aol.com/lifestyle/the-best-bluetooth...

    The Tile Pro is arguably the best product in Tile's lineup, offering better range and a louder chime than the slightly cheaper Tile Mate and the Tile Sticker. It also has a replaceable battery.

  8. Tessellation - Wikipedia

    en.wikipedia.org/wiki/Tessellation

    An edge-to-edge tiling is any polygonal tessellation where adjacent tiles only share one full side, i.e., no tile shares a partial side or more than one side with any other tile. In an edge-to-edge tiling, the sides of the polygons and the edges of the tiles are the same.

  9. Yes, Ties Are Back. Here's an Indispensable Guide to Buying ...

    www.aol.com/yes-ties-back-heres-indispensable...

    Ties are one of the great hacks of affordable menswear; so many good ones have been made over the years that it’s easy to find fantastic-looking, well-made ones for just a few bucks in vintage ...