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  2. Hexagonal crystal family - Wikipedia

    en.wikipedia.org/wiki/Hexagonal_crystal_family

    The unit cell is a rhombohedron (which gives the name for the rhombohedral lattice). This is a unit cell with parameters a = b = c; α = β = γ ≠ 90°. [5] In practice, the hexagonal description is more commonly used because it is easier to deal with a coordinate system with two 90° angles.

  3. Crystal system - Wikipedia

    en.wikipedia.org/wiki/Crystal_system

    Crystals can be classified in three ways: lattice systems, crystal systems and crystal families. The various classifications are often confused: in particular the trigonal crystal system is often confused with the rhombohedral lattice system, and the term "crystal system" is sometimes used to mean "lattice system" or "crystal family".

  4. Miller index - Wikipedia

    en.wikipedia.org/wiki/Miller_index

    With hexagonal and rhombohedral lattice systems, it is possible to use the Bravais–Miller system, which uses four indices (h k i ℓ) that obey the constraint h + k + i = 0. Here h , k and ℓ are identical to the corresponding Miller indices, and i is a redundant index.

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  6. Triply periodic minimal surface - Wikipedia

    en.wikipedia.org/wiki/Triply_periodic_minimal...

    Numerous examples are known with cubic, tetragonal, rhombohedral, and orthorhombic symmetries. Monoclinic and triclinic examples are certain to exist, but have proven hard to parametrise. [1] TPMS are of relevance in natural science. TPMS have been observed as biological membranes, [2] as block copolymers, [3] equipotential surfaces in crystals ...

  7. Today’s NYT ‘Strands’ Hints, Spangram and Answers for Friday ...

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    According to the New York Times, here's exactly how to play Strands: Find theme words to fill the board. Theme words stay highlighted in blue when found.

  8. Mark Cuban says AI won't have much of an impact on jobs that ...

    www.aol.com/mark-cuban-says-ai-wont-011056914.html

    The World Economic Forum reported in 2023 that employers expected 44% of workers' skills to be "disrupted" within five years, requiring a massive effort on worker retraining.

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