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Proof step 7 from proof une-01 (previous step)

∀ a. ¬ a ∈ s1 ∧ ¬ a ∈ s2 ⊦ a ∈ s2, ¬ a ∈ s1 ∧ ¬ a0 ∈ s2

User applied rule all left

And obtained the following new goals

Proof step 8:
¬ a ∈ s1 ∧ ¬ a ∈ s2, ∀ a. ¬ a ∈ s1 ∧ ¬ a ∈ s2 ⊦ a ∈ s2, ¬ a ∈ s1 ∧ ¬ a0 ∈ s2

Rule argument

pos: left 1 terms: a abort: F discard: F computed: T

Additional information

Used terms: a