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Scalar may refer to:

  • Scalar (mathematics), an element of a field, usually a real number, which is used to define a vector space
  • Scalar (physics), a quantity represented by a mathematical scalar that is independent of specific classes of coordinate systems, or one that is usually said to be described by a single real number
    • Lorentz scalar, a quantity in the theory of relativity which is invariant under a Lorentz transformation
  • Variable (computing), or scalar, an atomic quantity that can hold only one value at a time

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