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  2. Orthogonal coordinates - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_coordinates

    Orthogonal coordinates. In mathematics, orthogonal coordinates are defined as a set of d coordinates in which the coordinate hypersurfaces all meet at right angles (note that superscripts are indices, not exponents ). A coordinate surface for a particular coordinate qk is the curve, surface, or hypersurface on which qk is a constant.

  3. Z - Wikipedia

    en.wikipedia.org/wiki/Z

    In chemistry, the letter Z is used to denote the Atomic number of an element (number of protons), such as Z =3 for Lithium. In electrical engineering, Z is used to denote electrical impedance. In astronomy, z is a dimensionless quantity representing redshift. In nuclear physics, Z denotes the atomic number and. Z0.

  4. Lithuanian orthography - Wikipedia

    en.wikipedia.org/wiki/Lithuanian_orthography

    Today, the Lithuanian alphabet consists of 32 letters. It features an unusual collation order in that "Y" occurs between I nosinė (Į) and J. While absent from the alphabet, letters Q, W and X have their place in collation order: Q is located between P and R, and W with X are preceded by letter V.

  5. Kidney Failure Symptoms: Early and Advanced Symptoms - Healthline

    www.healthline.com/health/kidney-health/kidney...

    What Are the Symptoms of Kidney Failure? Urinary problems. Swelling. Shortness of breath. Fatigue. GI symptoms. Neurological symptoms. Muscle cramps.

  6. Gmail - Wikipedia

    en.wikipedia.org/wiki/Gmail

    Gmail is the email service provided by Google. As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. [1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party email ...

  7. Backslash - Wikipedia

    en.wikipedia.org/wiki/Backslash

    The backslash \ is a mark used mainly in computing and mathematics. It is the mirror image of the common slash /. It is a relatively recent mark, first documented in the 1930s. It is sometimes called a hack, whack, escape (from C / UNIX ), reverse slash, slosh, downwhack, backslant, backwhack, bash, reverse slant, reverse solidus, and reversed ...

  8. U - Wikipedia

    en.wikipedia.org/wiki/U

    U is used in the symbol of the World War II organization Ustaše. U is an honorific in Burmese. Related characters Ancestors, descendants and siblings. 𐤅 ‎ : Semitic letter Waw, from which the following symbols originally derive Υ υ : Greek letter Upsilon, from which U derives V v : Latin letter V, descended from U

  9. Polarization identity - Wikipedia

    en.wikipedia.org/wiki/Polarization_identity

    Polarization identity. In linear algebra, a branch of mathematics, the polarization identity is any one of a family of formulas that express the inner product of two vectors in terms of the norm of a normed vector space. If a norm arises from an inner product then the polarization identity can be used to express this inner product entirely in ...