qed.
lemma rdsx_unit (h) (o) (G): āI,L. G ā¢ ā¬*[h, o, #0] šā¦L.ā¤{I}ā¦.
#h #o #G #I #L1 @rdsx_intro
#Y #HY #HnY elim HnY -HnY
elim (lpx_inv_unit_sn ā¦ HY) -HY #L2 #HL12 #H destruct
qed.
lemma rdsx_unit (h) (o) (G): āI,L. G ā¢ ā¬*[h, o, #0] šā¦L.ā¤{I}ā¦.
#h #o #G #I #L1 @rdsx_intro
#Y #HY #HnY elim HnY -HnY
elim (lpx_inv_unit_sn ā¦ HY) -HY #L2 #HL12 #H destruct