Theorem Proving

SNARK uses term rewriting based on a recursive path ordering:

(all (onid dnid eta)
  (= (a-sent (abs naif-id-to-body onid)
             (abs naif-id-to-body dnid)
             (abs ephemeris-time-to-time eta))
    (abs ephemeris-time-to-time
         (sent onid dnid eta))))

SNARK uses an agenda for ordering formulas to be proved. Agenda-ordering strategy: give priority to lightlike?(c,v) involving a constant c and variable v.

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