Nuprl Lemma : primrec-as-fix
∀[n,b,c:Top]. (primrec(n;b;c) ~ fix((λp,n. if (n) < (1) then b else (c (n - 1) (p (n - 1))))) n)
Proof
Definitions occuring in Statement :
primrec: primrec(n;b;c),
uall: ∀[x:A]. B[x],
top: Top,
less: if (a) < (b) then c else d,
apply: f a,
fix: fix(F),
lambda: λx.A[x],
subtract: n - m,
natural_number: $n,
sqequal: s ~ t
Definitions unfolded in proof :
uall: ∀[x:A]. B[x],
member: t ∈ T,
all: ∀x:A. B[x],
nat: ℕ,
implies: P ⇒ Q,
false: False,
and: P ∧ Q,
ge: i ≥ j ,
le: A ≤ B,
cand: A c∧ B,
less_than: a < b,
squash: ↓T,
guard: {T},
uimplies: b supposing a,
prop: ℙ,
top: Top,
bool: 𝔹,
unit: Unit,
it: ⋅,
btrue: tt,
uiff: uiff(P;Q),
ifthenelse: if b then t else f fi ,
not: ¬A,
less_than': less_than'(a;b),
true: True,
bfalse: ff,
exists: ∃x:A. B[x],
or: P ∨ Q,
sq_type: SQType(T),
bnot: ¬bb,
assert: ↑b,
iff: P ⇐⇒ Q,
rev_implies: P ⇐ Q,
decidable: Dec(P),
primrec: primrec(n;b;c),
primtailrec: primtailrec(n;i;b;f),
subtract: n - m,
has-value: (a)↓
Lemmas referenced :
nat_properties,
less_than_transitivity1,
less_than_irreflexivity,
ge_wf,
istype-less_than,
primrec0_lemma,
istype-void,
subtract-1-ge-0,
primrec-unroll,
lt_int_wf,
eqtt_to_assert,
assert_of_lt_int,
less-iff-le,
add_functionality_wrt_le,
add-associates,
add-zero,
add-commutes,
le-add-cancel2,
eqff_to_assert,
bool_cases_sqequal,
subtype_base_sq,
bool_wf,
bool_subtype_base,
iff_transitivity,
assert_wf,
bnot_wf,
not_wf,
less_than_wf,
iff_weakening_uiff,
assert_of_bnot,
istype-assert,
istype-nat,
istype-top,
decidable__le,
not-lt-2,
zero-add,
le-add-cancel,
istype-false,
not-le-2,
condition-implies-le,
minus-add,
minus-zero,
minus-one-mul,
minus-one-mul-top,
istype-le,
istype-int,
has-value_wf_base,
is-exception_wf,
exception-not-value,
value-type-has-value,
int-value-type
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
Error :isect_memberFormation_alt,
introduction,
cut,
Error :lambdaFormation_alt,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesisEquality,
hypothesis,
setElimination,
rename,
intWeakElimination,
independent_pairFormation,
productElimination,
imageElimination,
natural_numberEquality,
independent_isectElimination,
independent_functionElimination,
voidElimination,
Error :universeIsType,
sqequalRule,
Error :lambdaEquality_alt,
dependent_functionElimination,
Error :isect_memberEquality_alt,
axiomSqEquality,
Error :isectIsTypeImplies,
Error :inhabitedIsType,
Error :functionIsTypeImplies,
because_Cache,
unionElimination,
equalityElimination,
equalityTransitivity,
equalitySymmetry,
addEquality,
Error :dependent_pairFormation_alt,
Error :equalityIstype,
promote_hyp,
instantiate,
cumulativity,
Error :functionIsType,
lessCases,
imageMemberEquality,
baseClosed,
callbyvalueReduce,
sqleReflexivity,
Error :dependent_set_memberEquality_alt,
minusEquality,
sqequalSqle,
divergentSqle,
callbyvalueLess,
baseApply,
closedConclusion,
lessExceptionCases,
axiomSqleEquality,
intEquality,
exceptionSqequal
Latex:
\mforall{}[n,b,c:Top]. (primrec(n;b;c) \msim{} fix((\mlambda{}p,n. if (n) < (1) then b else (c (n - 1) (p (n - 1))))) n)
Date html generated:
2019_06_20-AM-11_27_49
Last ObjectModification:
2019_01_28-PM-05_55_20
Theory : call!by!value_2
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