is mentioned by

Thm* x:Label, r:rel(). (x rel_vars(r)) (i:. i < ||r.args|| & (x term_vars(r.args[i])))	[member_rel_vars]
Thm* c1,c2:Collection(SimpleType), s:SimpleType. s st_app(c1;c2) (a:SimpleType. a c2 & as c1)	[member_st_app]
Thm* a,b:Term List. a = b ||a|| = ||b|| (i:. i < ||a|| & a[i] = b[i])	[unequal_termlists]
Def pred_mentions(p;x) == r:rel(). r p & rel_mentions(r;x)	[pred_mentions]
Def rel_mentions(r;x) == i:. i < ||r.args|| & (x term_vars(r.args[i]))	[rel_mentions]
Def covers_var(A;x) == fr:frame(). fr < fr A.frame | fr.var = x > & (a:Label. (a fr.acts) (ef:eff(). ef < ef A.eff | ef.kind = a & ef.smt.lbl = x > ))	[covers_var]

In prior sections: core fun 1 int 2 mb nat num thy 1 mb list 1 mb collection mb list 2

Try larger context: GenAutomata