in·vari·ant /-ənt/
  (a.)無變化的,不變的不變量
  invariant
  不變
  In·va·ri·ant n. Math. An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations.
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  invariant
       adj 1: unaffected by a designated operation or transformation
       2: persistent in occurrence and unvarying in nature;
          "maintained a constant temperature"; "a constant beat";
          "principles of unvarying validity"; "a steady breeze"
          [syn: changeless, constant, steady, unvarying]