Nuprl Lemma : or_true_l
∀[A:ℙ]. (True ∨ A ⇐⇒ True)
Proof
Definitions occuring in Statement :
uall: ∀[x:A]. B[x],
prop: ℙ,
iff: P ⇐⇒ Q,
or: P ∨ Q,
true: True
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
iff: P ⇐⇒ Q,
and: P ∧ Q,
implies: P ⇒ Q,
true: True,
member: t ∈ T,
prop: ℙ,
rev_implies: P ⇐ Q,
or: P ∨ Q
Lemmas referenced :
or_wf,
true_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
Error :isect_memberFormation_alt,
independent_pairFormation,
lambdaFormation,
natural_numberEquality,
cut,
introduction,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesis,
hypothesisEquality,
inlFormation,
Error :universeIsType,
universeEquality
Latex:
\mforall{}[A:\mBbbP{}]. (True \mvee{} A \mLeftarrow{}{}\mRightarrow{} True)
Date html generated:
2019_06_20-AM-11_16_24
Last ObjectModification:
2018_09_26-AM-10_24_12
Theory : core_2
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