Nuprl Lemma : assert_of_ff
¬↑ff
Proof
Definitions occuring in Statement :
assert: ↑b,
bfalse: ff,
not: ¬A
Definitions unfolded in proof :
not: ¬A,
implies: P ⇒ Q,
member: t ∈ T,
uall: ∀[x:A]. B[x],
prop: ℙ,
assert: ↑b,
ifthenelse: if b then t else f fi ,
bfalse: ff,
false: False
Lemmas referenced :
assert_wf,
bfalse_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
Error :lambdaFormation_alt,
Error :universeIsType,
cut,
introduction,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesis,
voidElimination
Latex:
\mneg{}\muparrow{}ff
Date html generated:
2019_06_20-AM-11_20_04
Last ObjectModification:
2018_09_27-PM-06_41_48
Theory : union
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