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Mathematical notation
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=== International standard mathematical notation === The [[International Organization for Standardization]] (ISO) is an [[international standard]] development organization composed of representatives from the national [[Standards organization|standards organizations]] of member countries. The international standard [[ISO 80000-2]] (previously, [[ISO 31-11]]) specifies symbols for use in mathematical equations. The standard requires use of italic fonts for variables (e.g., {{nowrap|1=''E'' = ''mc''<sup>2</sup>}}) and roman (upright) fonts for mathematical constants (e.g., e or Ο).
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