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15 include "basic_2/syntax/voids.ma".
17 (* EQUIVALENCE FOR LOCAL ENVIRONMENTS UP TO EXCLUSION BINDERS ***************)
19 (* Main inversion lemmas ****************************************************)
21 theorem voids_inj: ∀L1,L2,n1,n2. ⓧ*[n1]L1 ≋ ⓧ*[n2]L2 →
22 ∀m1,m2. ⓧ*[m1]L1 ≋ ⓧ*[m2]L2 →