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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/notation/functions/weight_1.ma".
16 include "basic_2/grammar/term.ma".
18 (* WEIGHT OF A TERM *********************************************************)
20 let rec tw T ≝ match T with
22 | TPair _ V T ⇒ tw V + tw T + 1
25 interpretation "weight (term)" 'Weight T = (tw T).
27 (* Basic properties *********************************************************)
29 (* Basic_1: was: tweight_lt *)
30 lemma tw_pos: ∀T. 1 ≤ ♯{T}.
34 (* Basic_1: removed theorems 11:
35 wadd_le wadd_lt wadd_O weight_le weight_eq weight_add_O
36 weight_add_S tlt_trans tlt_head_sx tlt_head_dx tlt_wf_ind
38 (* Basic_1: removed local theorems 1: q_ind *)