Nuprl Lemma : ni-max-assoc
∀[x,y,z:ℕ∞]. (ni-max(ni-max(x;y);z) = ni-max(x;ni-max(y;z)) ∈ ℕ∞)
Proof
Definitions occuring in Statement :
ni-max: ni-max(f;g)
,
nat-inf: ℕ∞
,
uall: ∀[x:A]. B[x]
,
equal: s = t ∈ T
Definitions unfolded in proof :
uall: ∀[x:A]. B[x]
,
member: t ∈ T
,
nat-inf: ℕ∞
,
squash: ↓T
,
so_lambda: λ2x.t[x]
,
implies: P
⇒ Q
,
prop: ℙ
,
nat: ℕ
,
ge: i ≥ j
,
all: ∀x:A. B[x]
,
decidable: Dec(P)
,
or: P ∨ Q
,
uimplies: b supposing a
,
satisfiable_int_formula: satisfiable_int_formula(fmla)
,
exists: ∃x:A. B[x]
,
false: False
,
not: ¬A
,
top: Top
,
and: P ∧ Q
,
so_apply: x[s]
,
ni-max: ni-max(f;g)
,
bool: 𝔹
,
unit: Unit
,
it: ⋅
,
btrue: tt
,
uiff: uiff(P;Q)
,
bor: p ∨bq
,
ifthenelse: if b then t else f fi
,
bfalse: ff
,
sq_type: SQType(T)
,
guard: {T}
,
bnot: ¬bb
,
assert: ↑b
Lemmas referenced :
ni-max_wf,
all_wf,
nat_wf,
assert_wf,
nat_properties,
decidable__le,
satisfiable-full-omega-tt,
intformand_wf,
intformnot_wf,
intformle_wf,
itermConstant_wf,
itermAdd_wf,
itermVar_wf,
int_formula_prop_and_lemma,
int_formula_prop_not_lemma,
int_formula_prop_le_lemma,
int_term_value_constant_lemma,
int_term_value_add_lemma,
int_term_value_var_lemma,
int_formula_prop_wf,
le_wf,
bool_wf,
eqtt_to_assert,
btrue_wf,
eqff_to_assert,
equal_wf,
bool_cases_sqequal,
subtype_base_sq,
bool_subtype_base,
assert-bnot,
bor_wf
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
thin,
hypothesisEquality,
hypothesis,
applyLambdaEquality,
setElimination,
rename,
sqequalRule,
imageMemberEquality,
baseClosed,
imageElimination,
dependent_set_memberEquality,
lambdaEquality,
functionEquality,
applyEquality,
functionExtensionality,
addEquality,
natural_numberEquality,
dependent_functionElimination,
unionElimination,
independent_isectElimination,
dependent_pairFormation,
int_eqEquality,
intEquality,
isect_memberEquality,
voidElimination,
voidEquality,
independent_pairFormation,
computeAll,
because_Cache,
axiomEquality,
lambdaFormation,
equalityElimination,
equalityTransitivity,
equalitySymmetry,
productElimination,
promote_hyp,
instantiate,
cumulativity,
independent_functionElimination
Latex:
\mforall{}[x,y,z:\mBbbN{}\minfty{}]. (ni-max(ni-max(x;y);z) = ni-max(x;ni-max(y;z)))
Date html generated:
2017_10_01-AM-08_29_52
Last ObjectModification:
2017_07_26-PM-04_24_12
Theory : basic
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