Radical



Radical can mean:

   * one who advocates revolutional social movement, in sociology, often
     contrasted with "reformist".
   * in chemistry, an atom or molecule with at least one unpaired electron
     (see radical (chemistry)).
   * in mathematics:
        o the n-th radical or root of a number a, written as [\sqrt[n]{a}],
          which is a number whose n-th power is a (see radical
          (mathematics)).
        o the Jacobson radical of a ring, which is an important ideal.
   * in linguistics, a part of a Chinese character (see radical (Chinese
     character)).

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