graph 1 2 Sections Graphs Doc

Def (xL.P(x)) == reduce(x,b. P(x) b;false;L)

is mentioned by

Def member-left-paren(x,y.E(x;y);i;s) == (xs.InjCase(x; a. E(a;i), false))[member-left-paren]
Def member-right-paren(x,y.E(x;y);i;s) == (xs.InjCase(x; a. false, E(a;i)))[member-right-paren]
Def member-paren(x,y.E(x;y);i;s) == (xs.InjCase(x; a. E(a;i), E(a;i)))[member-paren]

In prior sections: graph 1 1

Try larger context: Graphs

graph 1 2 Sections Graphs Doc