module type UNIT_IDX = Index_intf.UNIT_IDX
type t 
module E: Index_intf.EQUATION 
Module that describes indexed equations
type rhs = E.rhs 
Right hand side of equation
val empty : unit -> t
val is_empty : t -> bool
val add : t -> E.t -> t
Index the given (in)equation
val add_seq : t -> E.t Sequence.t -> t
val add_list : t -> E.t list -> t
val remove : t -> E.t -> t
val remove_seq : t -> E.t Sequence.t -> t
val size : t -> int
Number of indexed (in)equations
val iter : t -> (Index_intf.term -> E.t -> unit) -> unit
Iterate on indexed equations
val retrieve : ?subst:Index_intf.subst ->
       sign:bool ->
       t Scoped.t ->
       Index_intf.term Scoped.t ->
       (Index_intf.term * rhs * E.t * Index_intf.subst)
       Sequence.t
retrieve ~sign (idx,si) (t,st) acc iterates on
      (in)equations l ?= r of given sign and substitutions subst,
      such that subst(l, si) = t.
      It therefore finds generalizations of the query term.
val to_dot : t CCFormat.printer
print the index in the DOT format