I must be especially slow on the uptake today.
Now I got it :)

rule is a keyword (rule A==B ) and _rule are the functions visible by )d op 
rule.
(I've been looking for the function with "_" , unfortunately)


   [2] (D1,D1) -> RewriteRule(D2,D3,D1) from RewriteRule(D2,D3,D1)
            if D2 has SETCAT and D3 has Join(RING,PATMAB(D2),COMPAR,
            KONVERT(PATTERN(D2))) and D1 has Join(FS(D3),PATMAB(D2),
            KONVERT(PATTERN(D2)))

Thanks again.


On Saturday, 4 February 2017 23:59:18 UTC+1, Waldek Hebisch wrote:
>
> Kurt Pagani wrote: 
> > Now that I know the meaning of "_" I'm wondering where "_rule" is 
> defined ? 
>
> Hyperdoc shows one two argument 'rule', namely in RewriteRule 
> (file src/algebra/rule.spad). 
>   
> -- 
>                               Waldek Hebisch 
>

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