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17 include "basic_1A/ty3/defs.ma".
19 inductive csubt (g: G): C \to (C \to Prop) \def
20 | csubt_sort: \forall (n: nat).(csubt g (CSort n) (CSort n))
21 | csubt_head: \forall (c1: C).(\forall (c2: C).((csubt g c1 c2) \to (\forall
22 (k: K).(\forall (u: T).(csubt g (CHead c1 k u) (CHead c2 k u))))))
23 | csubt_void: \forall (c1: C).(\forall (c2: C).((csubt g c1 c2) \to (\forall
24 (b: B).((not (eq B b Void)) \to (\forall (u1: T).(\forall (u2: T).(csubt g
25 (CHead c1 (Bind Void) u1) (CHead c2 (Bind b) u2))))))))
26 | csubt_abst: \forall (c1: C).(\forall (c2: C).((csubt g c1 c2) \to (\forall
27 (u: T).(\forall (t: T).((ty3 g c1 u t) \to ((ty3 g c2 u t) \to (csubt g
28 (CHead c1 (Bind Abst) t) (CHead c2 (Bind Abbr) u)))))))).