rcvs(l;t) == filter(a.isrcv(l;a);map(t1.a(destination(l);t1);upto(t))) 

latex

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clarification:

w-rcvs(w; l; t) == filter(a.w-isrcvl(w; l; a);map(t1.w-a(w; destination(l); t1);upto(t))) 

latex

Definitions	filter(P;l), isrcv(l;a), map(f;as), a(i;t), destination(l), upto(n)
FDL editor aliases	w-rcvs