from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small increment or change in a variable.
  • n. Denotes a small — rather infinitesimal — variation of the value returned by a functional and/or of the functions on which that functional depends. This symbol can also — along a similar vein — be used to help denote virtual displacement and virtual work.
  • n. A small number, usually accompanied by ε.


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