mb event system 4 Sections EventSystems Doc
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Def ma-single-effect(ds; da; k; x; f) == mk-ma(ds; da; ; ; <k,x> : f; ; ; )

is mentioned by

Def ma-single-effect1(x;A;y;B;k;T;f)
Def == ma-single-effect(x : A  y : B; k : T; k; x; (s,v. f(s(x),s(y),v)))		[ma-single-effect1]
Def ma-single-effect0(x;A;k;T;f)
Def == ma-single-effect(x : A; k : T; k; x; (s,v. f(s(x),v)))		[ma-single-effect0]

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mb event system 4 Sections EventSystems Doc