(VAR x y z) (RULES +(+(x,y),z) -> +(x,+(y,z)) +(f(x),f(y)) -> f(+(x,y)) +(f(x),+(f(y),z)) -> +(f(+(x,y)),z) ) (COMMENT Example 2.2 (Associativity and Endomorphism) in \cite{SK90})
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