Nuprl Lemma : bs_tree_delete_wf
∀[E:Type]. ∀[cmp:comparison(E)]. ∀[x:E]. ∀[tr:ordered_bs_tree(E;cmp)].
  (bs_tree_delete(cmp;x;tr) ∈ ordered_bs_tree(E;cmp))
Proof
Definitions occuring in Statement : 
bs_tree_delete: bs_tree_delete(cmp;x;tr)
, 
ordered_bs_tree: ordered_bs_tree(E;cmp)
, 
comparison: comparison(T)
, 
uall: ∀[x:A]. B[x]
, 
member: t ∈ T
, 
universe: Type
Definitions unfolded in proof : 
uall: ∀[x:A]. B[x]
, 
member: t ∈ T
, 
ordered_bs_tree: ordered_bs_tree(E;cmp)
, 
prop: ℙ
, 
all: ∀x:A. B[x]
, 
so_lambda: λ2x.t[x]
, 
implies: P 
⇒ Q
, 
so_apply: x[s]
, 
guard: {T}
, 
bs_tree_delete: bs_tree_delete(cmp;x;tr)
, 
bs_tree_ordered: bs_tree_ordered(E;cmp;tr)
, 
bst_null: bst_null()
, 
bs_tree_ind: bs_tree_ind, 
true: True
, 
bst_leaf: bst_leaf(value)
, 
comparison: comparison(T)
, 
bool: 𝔹
, 
unit: Unit
, 
it: ⋅
, 
btrue: tt
, 
uiff: uiff(P;Q)
, 
and: P ∧ Q
, 
uimplies: b supposing a
, 
ifthenelse: if b then t else f fi 
, 
bfalse: ff
, 
exists: ∃x:A. B[x]
, 
or: P ∨ Q
, 
sq_type: SQType(T)
, 
bnot: ¬bb
, 
assert: ↑b
, 
false: False
, 
bst_node: bst_node(left;value;right)
, 
less_than: a < b
, 
less_than': less_than'(a;b)
, 
top: Top
, 
squash: ↓T
, 
not: ¬A
, 
cand: A c∧ B
, 
sq_stable: SqStable(P)
, 
trans: Trans(T;x,y.E[x; y])
Lemmas referenced : 
bs_tree_delete_wf1, 
bs_tree_ordered_wf, 
ordered_bs_tree_wf, 
comparison_wf, 
bs_tree-induction, 
bs_tree_wf, 
true_wf, 
eq_int_wf, 
bool_wf, 
eqtt_to_assert, 
assert_of_eq_int, 
eqff_to_assert, 
equal_wf, 
bool_cases_sqequal, 
subtype_base_sq, 
bool_subtype_base, 
assert-bnot, 
neg_assert_of_eq_int, 
bst_node_wf, 
lt_int_wf, 
assert_of_lt_int, 
top_wf, 
less_than_wf, 
member_bs_tree_wf, 
member-bs_tree_delete-implies, 
bst_null?_wf, 
bs_tree_max_wf, 
set_wf, 
all_wf, 
or_wf, 
not_wf, 
assert_wf, 
sq_stable__bs_tree_ordered, 
strict-comparison-trans
Rules used in proof : 
sqequalSubstitution, 
sqequalTransitivity, 
computationStep, 
sqequalReflexivity, 
isect_memberFormation, 
introduction, 
cut, 
sqequalHypSubstitution, 
setElimination, 
thin, 
rename, 
dependent_set_memberEquality, 
extract_by_obid, 
isectElimination, 
cumulativity, 
hypothesisEquality, 
hypothesis, 
sqequalRule, 
axiomEquality, 
equalityTransitivity, 
equalitySymmetry, 
isect_memberEquality, 
because_Cache, 
dependent_functionElimination, 
universeEquality, 
lambdaEquality, 
functionEquality, 
independent_functionElimination, 
lambdaFormation, 
natural_numberEquality, 
applyEquality, 
unionElimination, 
equalityElimination, 
productElimination, 
independent_isectElimination, 
dependent_pairFormation, 
promote_hyp, 
instantiate, 
voidElimination, 
lessCases, 
sqequalAxiom, 
independent_pairFormation, 
voidEquality, 
imageMemberEquality, 
baseClosed, 
imageElimination, 
productEquality
Latex:
\mforall{}[E:Type].  \mforall{}[cmp:comparison(E)].  \mforall{}[x:E].  \mforall{}[tr:ordered\_bs\_tree(E;cmp)].
    (bs\_tree\_delete(cmp;x;tr)  \mmember{}  ordered\_bs\_tree(E;cmp))
Date html generated:
2017_10_01-AM-08_31_43
Last ObjectModification:
2017_07_26-PM-04_25_06
Theory : tree_1
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