File: string_ISO_DEF.doc

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\THEOREM string_ISO_DEF string
|- (!a. ABS_string(REP_string a) = a) /\
   (!r.
     TRP
     (\v tl.
       (v = INL one) /\ (LENGTH tl = 0) \/
       (?a. v = INR a) /\ (LENGTH tl = SUC 0))
     r =
     (REP_string(ABS_string r) = r))
\ENDTHEOREM