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  2. Möbius strip - Wikipedia

    en.wikipedia.org/wiki/Möbius_strip

    In mathematics, a Möbius strip, Möbius band, or Möbius loop [a] is a surface that can be formed by attaching the ends of a strip of paper together with a half-twist. As a mathematical object, it was discovered by Johann Benedict Listing and August Ferdinand Möbius in 1858, but it had already appeared in Roman mosaics from the third century CE .

  3. Tietze's graph - Wikipedia

    en.wikipedia.org/wiki/Tietze's_graph

    In the mathematical field of graph theory, Tietze's graph is an undirected cubic graph with 12 vertices and 18 edges. It is named after Heinrich Franz Friedrich Tietze, who showed in 1910 that the Möbius strip can be subdivided into six regions that all touch each other – three along the boundary of the strip and three along its center line – and therefore that graphs that are embedded ...

  4. Orientability - Wikipedia

    en.wikipedia.org/wiki/Orientability

    A torus is an orientable surface The Möbius strip is a non-orientable surface. Note how the disk flips with every loop. The Roman surface is non-orientable.. In mathematics, orientability is a property of some topological spaces such as real vector spaces, Euclidean spaces, surfaces, and more generally manifolds that allows a consistent definition of "clockwise" and "anticlockwise". [1]

  5. Non-orientable wormhole - Wikipedia

    en.wikipedia.org/wiki/Non-orientable_wormhole

    The alternative way of connecting the surfaces makes the "connection map" appear the same at both mouths. This configuration reverses the "handedness" or "chirality" of any objects passing through. If a spaceship pilot writes the word "IOTA" on the inside of their forward window, then, as the ship's nose passes through the wormhole and the ship's window intersects the surface, an observer at ...

  6. Fiber bundle - Wikipedia

    en.wikipedia.org/wiki/Fiber_bundle

    The Möbius strip is a nontrivial bundle over the circle. Perhaps the simplest example of a nontrivial bundle E {\displaystyle E} is the Möbius strip . It has the circle that runs lengthwise along the center of the strip as a base B {\displaystyle B} and a line segment for the fiber F {\displaystyle F} , so the Möbius strip is a bundle of the ...

  7. Johann Benedict Listing - Wikipedia

    en.wikipedia.org/wiki/Johann_Benedict_Listing

    Johann Benedict Listing (25 July 1808 – 24 December 1882) was a German mathematician.. J. B. Listing was born in Frankfurt and died in Göttingen.He finished his studies at the University of Göttingen in 1834, and in 1839 he succeeded Wilhelm Weber as professor of physics.

  8. Three utilities problem - Wikipedia

    en.wikipedia.org/wiki/Three_utilities_problem

    [21] [5] Similarly, if the three utilities puzzle is presented on a sheet of a transparent material, it may be solved after twisting and gluing the sheet to form a Möbius strip. [ 22 ] Another way of changing the rules of the puzzle that would make it solvable, suggested by Henry Dudeney , is to allow utility lines to pass through other houses ...

  9. Recycling symbol - Wikipedia

    en.wikipedia.org/wiki/Recycling_symbol

    The logo is usually displayed with the arrows circulating clockwise, but the underlying Möbius strip exists in two topologically distinct mirror-image forms of opposite handedness. The American Paper Institute originally promoted four different variants of the recycling symbol for different purposes.