Nuprl Lemma : simple_fan_theorem-ext
∀[X:n:ℕ ⟶ (ℕn ⟶ 𝔹) ⟶ ℙ]
  (∀n:ℕ. ∀s:ℕn ⟶ 𝔹.  Dec(X[n;s])) 
⇒ (∃k:ℕ [(∀f:ℕ ⟶ 𝔹. ∃n:ℕk. X[n;f])]) supposing ∀f:ℕ ⟶ 𝔹. (↓∃n:ℕ. X[n;f])
Proof
Definitions occuring in Statement : 
int_seg: {i..j-}
, 
nat: ℕ
, 
bool: 𝔹
, 
decidable: Dec(P)
, 
uimplies: b supposing a
, 
uall: ∀[x:A]. B[x]
, 
prop: ℙ
, 
so_apply: x[s1;s2]
, 
all: ∀x:A. B[x]
, 
sq_exists: ∃x:A [B[x]]
, 
exists: ∃x:A. B[x]
, 
squash: ↓T
, 
implies: P 
⇒ Q
, 
function: x:A ⟶ B[x]
, 
natural_number: $n
Definitions unfolded in proof : 
member: t ∈ T
, 
bottom: ⊥
, 
seq-normalize: seq-normalize(n;s)
, 
uall: ∀[x:A]. B[x]
, 
top: Top
, 
has-value: (a)↓
, 
not: ¬A
, 
implies: P 
⇒ Q
, 
false: False
, 
and: P ∧ Q
, 
all: ∀x:A. B[x]
, 
bool: 𝔹
, 
unit: Unit
, 
it: ⋅
, 
btrue: tt
, 
uiff: uiff(P;Q)
, 
uimplies: b supposing a
, 
less_than: a < b
, 
less_than': less_than'(a;b)
, 
true: True
, 
squash: ↓T
, 
prop: ℙ
, 
bfalse: ff
, 
exists: ∃x:A. B[x]
, 
or: P ∨ Q
, 
sq_type: SQType(T)
, 
guard: {T}
, 
bnot: ¬bb
, 
ifthenelse: if b then t else f fi 
, 
assert: ↑b
, 
simple_fan_theorem, 
basic_bar_induction, 
so_lambda: so_lambda(x,y,z,w.t[x; y; z; w])
, 
so_apply: x[s1;s2;s3;s4]
, 
strict4: strict4(F)
Lemmas referenced : 
simple_fan_theorem, 
strictness-apply, 
bottom_diverge, 
exception-not-bottom, 
has-value_wf_base, 
is-exception_wf, 
lt_int_wf, 
bool_wf, 
eqtt_to_assert, 
assert_of_lt_int, 
top_wf, 
less_than_wf, 
bottom-sqle, 
eqff_to_assert, 
equal_wf, 
bool_cases_sqequal, 
subtype_base_sq, 
bool_subtype_base, 
assert-bnot, 
exception-not-value, 
value-type-has-value, 
int-value-type, 
lifting-strict-less, 
base_wf, 
basic_bar_induction
Rules used in proof : 
introduction, 
sqequalSubstitution, 
sqequalTransitivity, 
computationStep, 
sqequalReflexivity, 
cut, 
instantiate, 
extract_by_obid, 
hypothesis, 
sqequalRule, 
thin, 
sqequalHypSubstitution, 
equalityTransitivity, 
equalitySymmetry, 
isectElimination, 
isect_memberEquality, 
voidElimination, 
voidEquality, 
sqequalSqle, 
sqleRule, 
sqleReflexivity, 
divergentSqle, 
callbyvalueCallbyvalue, 
callbyvalueReduce, 
independent_functionElimination, 
callbyvalueExceptionCases, 
axiomSqleEquality, 
exceptionSqequal, 
baseApply, 
closedConclusion, 
baseClosed, 
hypothesisEquality, 
callbyvalueLess, 
productElimination, 
lambdaFormation, 
unionElimination, 
equalityElimination, 
because_Cache, 
independent_isectElimination, 
lessCases, 
isect_memberFormation, 
sqequalAxiom, 
independent_pairFormation, 
natural_numberEquality, 
imageMemberEquality, 
imageElimination, 
dependent_pairFormation, 
promote_hyp, 
dependent_functionElimination, 
cumulativity, 
lessExceptionCases, 
intEquality, 
callbyvalueAdd, 
addExceptionCases, 
inlFormation
Latex:
\mforall{}[X:n:\mBbbN{}  {}\mrightarrow{}  (\mBbbN{}n  {}\mrightarrow{}  \mBbbB{})  {}\mrightarrow{}  \mBbbP{}]
    (\mforall{}n:\mBbbN{}.  \mforall{}s:\mBbbN{}n  {}\mrightarrow{}  \mBbbB{}.    Dec(X[n;s]))  {}\mRightarrow{}  (\mexists{}k:\mBbbN{}  [(\mforall{}f:\mBbbN{}  {}\mrightarrow{}  \mBbbB{}.  \mexists{}n:\mBbbN{}k.  X[n;f])]) 
    supposing  \mforall{}f:\mBbbN{}  {}\mrightarrow{}  \mBbbB{}.  (\mdownarrow{}\mexists{}n:\mBbbN{}.  X[n;f])
Date html generated:
2018_05_21-PM-00_03_36
Last ObjectModification:
2018_05_19-AM-07_10_58
Theory : bool_1
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