M.bframe(k sends on l)
== L != 1of(2of(2of(2of(2of(2of(2of(2of(2of(2of(M))))))))))(k)  deq-member(IdLnkDeq;l;L) 

latex

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clarification:

M.bframe(k sends on l)
== fpf-val(KindDeq;
== fpf-val(1of(2of(2of(2of(2of(2of(2of(2of(2of(2of(M))))))))));
== fpf-val(k;
== fpf-val(k,L.deq-member(IdLnkDeq;l;L)) 

latex

Definitions	z != f(x)  P(a;z), KindDeq, 1of(t), 2of(t), b, deq-member(eq;x;L), IdLnkDeq
FDL editor aliases	ma-bframe