Trigger
Trigger is an abstract type and also direct subtype of Function
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TYPE INCLUSION RELATIONSHIPS
AVAILABLE FUNCTIONS
AVAILABLE CREATE FUNCTION KEYS
This type represents any predicate function that maps u variables x₁ , x₂ , ... , xᵤ into one single boolean variable.
Note, the function can still accept as input more than u variables, but in that case it only processes the first u variables and ignores the rest.
It is also possible for u to be undetermined, in which case the function can process any number of variables, perhaps even a zero number of variables.
