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4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
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15 include "basic_2/grammar/lenv_weight.ma".
16 include "basic_2/grammar/cl_shift.ma".
18 (* WEIGHT OF A CLOSURE ******************************************************)
20 definition cw: lenv → term → ? ≝ λL,T. #{L} + #{T}.
22 interpretation "weight (closure)" 'Weight L T = (cw L T).
24 (* Basic properties *********************************************************)
26 (* Basic_1: was: flt_wf__q_ind *)
28 (* Basic_1: was: flt_wf_ind *)
29 axiom cw_wf_ind: ∀R:lenv→predicate term.
30 (∀L2,T2. (∀L1,T1. #{L1,T1} < #{L2,T2} → R L1 T1) → R L2 T2) →
33 (* Basic_1: was: flt_shift *)
34 lemma cw_shift: ∀a,K,I,V,T. #{K. ⓑ{I} V, T} < #{K, ⓑ{a,I} V. T}.
38 lemma tw_shift: ∀L,T. #{L, T} ≤ #{L @@ T}.
41 @transitive_le [3: @IHL |2: /2 width=2/ | skip ]
44 lemma cw_tpair_sn: ∀I,L,V,T. #{L, V} < #{L, ②{I}V.T}.
45 #I #L #V #T normalize in ⊢ (? % %); //
48 lemma cw_tpair_dx: ∀I,L,V,T. #{L, T} < #{L, ②{I}V.T}.
49 #I #L #V #T normalize in ⊢ (? % %); //
52 lemma cw_tpair_dx_sn: ∀I1,I2,L,V1,V2,T. #{L, V2} < #{L, ②{I1}V1.②{I2}V2.T}.
53 #I1 #I2 #L #V1 #V2 #T normalize in ⊢ (? % %); /2 width=1/
56 lemma cw_tpair_dx_sn_shift: ∀a2,I1,I2,L,V1,V2,T.
57 #{L.ⓑ{I2}V2, T} < #{L, ②{I1}V1.ⓑ{a2,I2}V2.T}.
58 #a2 #I1 #I2 #L #V1 #V2 #T normalize in ⊢ (? % %); /2 width=1/
61 (* Basic_1: removed theorems 6:
62 flt_thead_sx flt_thead_dx flt_arith0 flt_arith1 flt_arith2 flt_trans