(VAR x y z) (RULES +(x,0) -> x +(x,i(x)) -> 0 +(+(x,y),z) -> +(x,+(y,z)) *(x,+(y,z)) -> +(*(x,y),*(x,z)) *(+(x,y),z) -> +(*(x,z),*(y,z)) ) (COMMENT Example 4.9 (Ring) in \cite{SK90})
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