| (m < bag0.max ⊃ bag0.max;m) < (bag = ∅ ⊃ m;(m < bag.max ⊃ bag.max;m)), bag ⊆ bag0, (∃ bag1. bag1.max < bag.max ∧ bag ⊆ bag1) → bag = ∅ ⊦ bag0 = ∅ |
(m < bag0.max ⊃ bag0.max;m) < (bag = ∅ ⊃ m;(m < bag.max ⊃ bag.max;m)), bag ⊆ bag0, (∃ bag1. bag1.max < bag.max ∧ bag ⊆ bag1) → bag = ∅ ⊦ bag0 = ∅