Nuprl Lemma : or_wf

[A,B:ℙ].  (A ∨ B ∈ ℙ)


Proof




Definitions occuring in Statement :  uall: [x:A]. B[x] prop: or: P ∨ Q member: t ∈ T
Definitions unfolded in proof :  uall: [x:A]. B[x] member: t ∈ T or: P ∨ Q prop:
Rules used in proof :  sqequalSubstitution sqequalTransitivity computationStep sqequalReflexivity isect_memberFormation introduction cut unionEquality hypothesisEquality sqequalHypSubstitution hypothesis sqequalRule axiomEquality equalityTransitivity equalitySymmetry universeEquality isect_memberEquality isectElimination thin because_Cache

Latex:
\mforall{}[A,B:\mBbbP{}].    (A  \mvee{}  B  \mmember{}  \mBbbP{})



Date html generated: 2016_05_13-PM-03_06_56
Last ObjectModification: 2016_01_06-PM-05_28_50

Theory : core_2


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