Nuprl Lemma : equal-nil-lists
∀[T:Type]. ∀[x,y:Top List]. (x = y ∈ (T List)) supposing ((↑null(y)) and (↑null(x)))
Proof
Definitions occuring in Statement :
null: null(as),
list: T List,
assert: ↑b,
uimplies: b supposing a,
uall: ∀[x:A]. B[x],
top: Top,
universe: Type,
equal: s = t ∈ 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,
ge: i ≥ j ,
uimplies: b supposing a,
satisfiable_int_formula: satisfiable_int_formula(fmla),
exists: ∃x:A. B[x],
not: ¬A,
top: Top,
and: P ∧ Q,
prop: ℙ,
subtype_rel: A ⊆r B,
guard: {T},
or: P ∨ Q,
assert: ↑b,
ifthenelse: if b then t else f fi ,
btrue: tt,
cons: [a / b],
colength: colength(L),
so_lambda: λ2x y.t[x; y],
so_apply: x[s1;s2],
nil: [],
it: ⋅,
so_lambda: λ2x.t[x],
so_apply: x[s],
sq_type: SQType(T),
bfalse: ff,
decidable: Dec(P),
less_than: a < b,
squash: ↓T,
less_than': less_than'(a;b)
Lemmas referenced :
nat_properties,
satisfiable-full-omega-tt,
intformand_wf,
intformle_wf,
itermConstant_wf,
itermVar_wf,
intformless_wf,
int_formula_prop_and_lemma,
int_formula_prop_le_lemma,
int_term_value_constant_lemma,
int_term_value_var_lemma,
int_formula_prop_less_lemma,
int_formula_prop_wf,
ge_wf,
less_than_wf,
assert_wf,
null_wf3,
equal-wf-T-base,
nat_wf,
colength_wf_list,
top_wf,
less_than_transitivity1,
less_than_irreflexivity,
list-cases,
nil_wf,
null_nil_lemma,
true_wf,
product_subtype_list,
spread_cons_lemma,
equal_wf,
subtype_base_sq,
set_subtype_base,
le_wf,
int_subtype_base,
null_cons_lemma,
false_wf,
intformeq_wf,
itermAdd_wf,
int_formula_prop_eq_lemma,
int_term_value_add_lemma,
decidable__le,
intformnot_wf,
int_formula_prop_not_lemma,
subtract_wf,
itermSubtract_wf,
int_term_value_subtract_lemma,
decidable__equal_int,
list_induction,
isect_wf,
cons_wf,
list_wf,
assert_elim,
bfalse_wf,
btrue_neq_bfalse
Rules used in proof :
sqequalSubstitution,
sqequalTransitivity,
computationStep,
sqequalReflexivity,
isect_memberFormation,
introduction,
cut,
thin,
lambdaFormation,
extract_by_obid,
sqequalHypSubstitution,
isectElimination,
hypothesisEquality,
hypothesis,
setElimination,
rename,
intWeakElimination,
natural_numberEquality,
independent_isectElimination,
dependent_pairFormation,
lambdaEquality,
int_eqEquality,
intEquality,
dependent_functionElimination,
isect_memberEquality,
voidElimination,
voidEquality,
sqequalRule,
independent_pairFormation,
computeAll,
independent_functionElimination,
axiomEquality,
equalityTransitivity,
equalitySymmetry,
because_Cache,
applyEquality,
unionElimination,
cumulativity,
promote_hyp,
hypothesis_subsumption,
productElimination,
baseClosed,
instantiate,
applyLambdaEquality,
dependent_set_memberEquality,
addEquality,
imageElimination,
addLevel,
levelHypothesis,
universeEquality
Latex:
\mforall{}[T:Type]. \mforall{}[x,y:Top List]. (x = y) supposing ((\muparrow{}null(y)) and (\muparrow{}null(x)))
Date html generated:
2018_05_21-PM-07_36_16
Last ObjectModification:
2017_07_26-PM-05_10_18
Theory : general
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