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  2. List of common physics notations - Wikipedia

    en.wikipedia.org/wiki/List_of_common_physics...

    Cartesian y-axis basis unit vector unitless kinetic energy: joule (J) wave vector: radian per meter (m −1) Boltzmann constant: joule per kelvin (J/K) wavenumber: radian per meter (m −1) stiffness: newton per meter (N⋅m −1) ^ Cartesian z-axis basis unit vector

  3. Patrick Berry - Wikipedia

    en.wikipedia.org/wiki/Patrick_Berry

    Patrick D. Berry (born 1970) is an American puzzle creator and editor who constructs crossword puzzles and variety puzzles. He had 227 crosswords published in The New York Times from 1999 to 2018. His how-to guide for crossword construction was first published as a For Dummies book in 2004.

  4. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE. "Say" for EG, used to mean "for example". More obscure clue words of this variety include: "Model" for T, referring to the Model T.

  5. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    the value of a plane angle in physics and mathematics; the angle to the z axis in spherical coordinates (mathematics) epoch or phase difference between two waves or vectors; the angle to the x axis in the xy-plane in spherical or cylindrical coordinates (physics) latitude in geodesy; radiant flux; neutron flux; Potential energy; electric potential

  6. Greater-than sign - Wikipedia

    en.wikipedia.org/wiki/Greater-than_sign

    The greater-than sign is a mathematical symbol that denotes an inequality between two values. The widely adopted form of two equal-length strokes connecting in an acute angle at the right, >, has been found in documents dated as far back as 1631. [1]

  7. Germanium - Wikipedia

    en.wikipedia.org/wiki/Germanium

    2 Ge. Germanium cluster anions (Zintl ions) such as Ge 4 2−, Ge 9 4−, Ge 9 2−, [(Ge 9) 2] 6− have been prepared by the extraction from alloys containing alkali metals and germanium in liquid ammonia in the presence of ethylenediamine or a cryptand. [42] [44] The oxidation states of the element in these ions are not integers—similar to ...

  8. Threshold energy - Wikipedia

    en.wikipedia.org/wiki/Threshold_energy

    In most cases, since momentum is also conserved, the threshold energy is significantly greater than the rest energy of the desired particle. The threshold energy should not be confused with the threshold displacement energy , which is the minimum energy needed to permanently displace an atom in a crystal to produce a crystal defect in radiation ...

  9. Bell's theorem - Wikipedia

    en.wikipedia.org/wiki/Bell's_theorem

    In any theory based on local hidden variables, Alice and Bob's probability of winning is no greater than /, regardless of what strategy they agree upon beforehand. However, if they share an entangled quantum state, their probability of winning can be as large as 2 + 2 4 ≈ 0.85 . {\displaystyle {\frac {2+{\sqrt {2}}}{4}}\approx 0.85\,.}