Helpers for sorting formulas into invariants, and other types of formulas
Static_prop: a proposition that does not include any variable relation nor any temporal operator. Primed_prop: a propostion that may include variabale and constant relations, without any temporal operator except un-nested X (next) or prime. Invar: proposition of the form always (phi) where phi does not include any temporal operator (the color pf phi is Init or Static_prop). Init: proposition without any temporal operator. Trans: proposition of the form always (phi) where the color of phi is Primed_prop. Temporal: any other proposition.
val to_string : goal_color -> stringval pp : Stdlib.Format.formatter -> goal_color -> unitremoves the top level always operator in an invariant elo formula
adds an always operator to an (invariant) elo formula if the outermost operator is not an always
val color : Elo.t -> Elo.fml -> goal_colorComputes the color of a formula