[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
⊢ MetrizableSpace M
[PROOFSTEP]
haveI := I.locally_compact
[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
this : LocallyCompactSpace H
⊢ MetrizableSpace M
[PROOFSTEP]
haveI := ChartedSpace.locallyCompact H M
[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
this✝ : LocallyCompactSpace H
this : LocallyCompactSpace M
⊢ MetrizableSpace M
[PROOFSTEP]
haveI : NormalSpace M := normal_of_paracompact_t2
[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
this✝¹ : LocallyCompactSpace H
this✝ : LocallyCompactSpace M
this : NormalSpace M
⊢ MetrizableSpace M
[PROOFSTEP]
haveI := I.secondCountableTopology
[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
this✝² : LocallyCompactSpace H
this✝¹ : LocallyCompactSpace M
this✝ : NormalSpace M
this : SecondCountableTopology H
⊢ MetrizableSpace M
[PROOFSTEP]
haveI := ChartedSpace.secondCountable_of_sigma_compact H M
[GOAL]
E : Type u_1
inst✝⁷ : NormedAddCommGroup E
inst✝⁶ : NormedSpace ℝ E
inst✝⁵ : FiniteDimensional ℝ E
H : Type u_2
inst✝⁴ : TopologicalSpace H
I : ModelWithCorners ℝ E H
M : Type u_3
inst✝³ : TopologicalSpace M
inst✝² : ChartedSpace H M
inst✝¹ : SigmaCompactSpace M
inst✝ : T2Space M
this✝³ : LocallyCompactSpace H
this✝² : LocallyCompactSpace M
this✝¹ : NormalSpace M
this✝ : SecondCountableTopology H
this : SecondCountableTopology M
⊢ MetrizableSpace M
[PROOFSTEP]
exact metrizableSpace_of_t3_second_countable M