Section ILogicLaterCoreRules.
Context {A} `{IL: ILLater A}.
Global Instance spec_later_entails:
Proper (lentails ==> lentails) illater.
Global Instance spec_later_equiv:
Proper (lequiv ==> lequiv) illater.

Lemma spec_later_and P P': |>(P //\\ P') -|- |>P //\\ |>P'.