Theorem: ContractingWith.efixedPoint_eq_of_edist_lt_top'
File: Mathlib/Topology/MetricSpace/Contracting.lean

Proof steps:
state_before: α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
⊢ efixedPoint' f hsc hsf hfs x hxs hx = efixedPoint' f htc htf hft y hyt hy
state_after: case refine_3
α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) < ⊤
tactic: refine (hf.eq_or_edist_eq_top_of_fixedPoints ?_ ?_).elim id fun h' ↦ False.elim (ne_of_lt ?_ h')
    <;> try apply efixedPoint_isFixedPt'
state_before: case refine_3
α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) < ⊤
state_after: case refine_3
α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy)
tactic: change edistLtTopSetoid.Rel _ _
state_before: case refine_3
α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy)
state_after: α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel (efixedPoint' f hsc hsf hfs x hxs hx) x

α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel x (efixedPoint' f htc htf hft y hyt hy)
tactic: trans x
state_before: α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel x (efixedPoint' f htc htf hft y hyt hy)
state_after: α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel x y

α : Type u_1
inst✝ : EMetricSpace α
cs : CompleteSpace α
K : ℝ≥0
f : α → α
hf : ContractingWith K f
s : Set α
hsc : IsComplete s
hsf : MapsTo f s s
hfs : ContractingWith K (MapsTo.restrict f s s hsf)
x : α
hxs : x ∈ s
hx : edist x (f x) ≠ ⊤
t : Set α
htc : IsComplete t
htf : MapsTo f t t
hft : ContractingWith K (MapsTo.restrict f t t htf)
y : α
hyt : y ∈ t
hy : edist y (f y) ≠ ⊤
hxy : edist x y ≠ ⊤
h' : edist (efixedPoint' f hsc hsf hfs x hxs hx) (efixedPoint' f htc htf hft y hyt hy) = ⊤
⊢ edistLtTopSetoid.Rel y (efixedPoint' f htc htf hft y hyt hy)
tactic: trans y