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4 (* ||A|| A project by Andrea Asperti *)
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15 include "basic_2/syntax/tdeq.ma".
16 include "basic_2/syntax/theq.ma".
18 (* HEAD EQUIVALENCE FOR TERMS ***********************************************)
20 (* Properties with degree-based equivalence for terms ***********************)
22 lemma tdeq_theq: ∀h,o,T1,T2. T1 ≛[h, o] T2 → T1 ⩳[h, o] T2.
23 #h #o #T1 #T2 * -T1 -T2 /2 width=3 by theq_sort, theq_pair/