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  2. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    Trigonometric functions and their reciprocals on the unit circle. All of the right-angled triangles are similar, i.e. the ratios between their corresponding sides are the same.

  3. Antisymmetric relation - Wikipedia

    en.wikipedia.org/wiki/Antisymmetric_relation

    In mathematics, a binary relation on a set is antisymmetric if there is no pair of distinct elements of each of which is related by to the other. More formally, is antisymmetric precisely if for all ,,, or equivalently, =.

  4. Symmetric matrix - Wikipedia

    en.wikipedia.org/wiki/Symmetric_matrix

    The sum and difference of two symmetric matrices is symmetric. This is not always true for the product: given symmetric matrices and , then is symmetric if and only if and commute, i.e., if =.

  5. Lorentz covariance - Wikipedia

    en.wikipedia.org/wiki/Lorentz_covariance

    In relativistic physics, Lorentz symmetry or Lorentz invariance, named after the Dutch physicist Hendrik Lorentz, is an equivalence of observation or observational symmetry due to special relativity implying that the laws of physics stay the same for all observers that are moving with respect to one another within an inertial frame.

  6. Symmetry in quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Symmetry_in_quantum_mechanics

    Symmetries in quantum mechanics describe features of spacetime and particles which are unchanged under some transformation, in the context of quantum mechanics, relativistic quantum mechanics and quantum field theory, and with applications in the mathematical formulation of the standard model and condensed matter physics.

  7. Pythagorean prime - Wikipedia

    en.wikipedia.org/wiki/Pythagorean_prime

    The Pythagorean prime 5 and its square root are both hypotenuses of right triangles with integer legs. The formulas show how to transform any right triangle with integer legs into another right triangle with integer legs whose hypotenuse is the square of the first triangle's hypotenuse.

  8. 2023 Đắk Lắk attacks - Wikipedia

    en.wikipedia.org/wiki/2023_Đắk_Lắk_attacks

    On June 11, 2023, an unidentified group of dozens of individuals attacked the People's Committee headquarters of the Ea Tiêu and Ea Ktur communes in Cư Kuin district, Đắk Lắk province, Vietnam resulting in 9 fatalities and 2 seriously injured individuals.

  9. June Carter Cash - Wikipedia

    en.wikipedia.org/wiki/June_Carter_Cash

    June, then 16, was a co-announcer with Ken Allyn and did the commercials on the radio shows for Red Star Flour, Martha White, and Thalhimers Department Store, just to name a few. [3] For the next year {1946}, the Carters and Doc and Carl did show dates within driving range of Richmond, through Virginia , Maryland , Delaware , and Pennsylvania .

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