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Theorem base for Specification set-nogen-union

This is a listing of all goals defined over the current specification. Axioms are yellow, proof obligations purple and theorems green. Click on individual names to get more information on the proof.

Name:	Sequent:	Type:
One	⊦ {a} = ∅ ++ a	An Axiom
Union	⊦ a ∈ sng1 ∪ sng2 ↔ a ∈ sng1 ∨ a ∈ sng2	An Axiom
Intersect	⊦ a ∈ sng1 ∩ sng2 ↔ a ∈ sng1 ∧ a ∈ sng2	An Axiom
Difference	⊦ a ∈ sng1 \ sng2 ↔ a ∈ sng1 ∧ ¬ a ∈ sng2	An Axiom
Delete	⊦ a ∈ sng -- b ↔ a ≠ b ∧ a ∈ sng	An Axiom