Specification int-mult

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enrich
   int-abs
with
   comment: useful spec-lemmas are mod(ls,le,eq,neq)... for stuff about 
i * j + j0 < i * j1 + j2 and p(le,ls) for i * j < i0 * j0
global simplification doesn't distribute, i.e. i * j + i * j0 => i * (j + j0), 
local does;
   functions 
       . * . : int × int → int prio 10 right;
   
   variables 
       i : int;
       j : int;
   
   
   axioms 
      Mult-zero: i * 0 = 0;
      used for: s, ls;
      
      Mult-succ: i * j +1 = i * j + i;
      
      Mult-pred: i * j -1 = i * j - i;
   
   
end enrich