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Theorem istotbnd3 35208
Description: A metric space is totally bounded iff there is a finite ε-net for every positive ε. This differs from the definition in providing a finite set of ball centers rather than a finite set of balls. (Contributed by Mario Carneiro, 12-Sep-2015.)
Assertion
Ref Expression
istotbnd3 (𝑀 ∈ (TotBnd‘𝑋) ↔ (𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
Distinct variable groups:   𝑣,𝑑,𝑥,𝑀   𝑋,𝑑,𝑣,𝑥

Proof of Theorem istotbnd3
Dummy variables 𝑏 𝑓 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 istotbnd 35206 . 2 (𝑀 ∈ (TotBnd‘𝑋) ↔ (𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))))
2 oveq1 7146 . . . . . . . . . . . 12 (𝑥 = (𝑓𝑏) → (𝑥(ball‘𝑀)𝑑) = ((𝑓𝑏)(ball‘𝑀)𝑑))
32eqeq2d 2812 . . . . . . . . . . 11 (𝑥 = (𝑓𝑏) → (𝑏 = (𝑥(ball‘𝑀)𝑑) ↔ 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))
43ac6sfi 8750 . . . . . . . . . 10 ((𝑤 ∈ Fin ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) → ∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))
54ex 416 . . . . . . . . 9 (𝑤 ∈ Fin → (∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑))))
65ad2antlr 726 . . . . . . . 8 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ 𝑤 = 𝑋) → (∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑))))
7 simprrl 780 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓:𝑤𝑋)
87frnd 6498 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓𝑋)
9 simplr 768 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑤 ∈ Fin)
107ffnd 6492 . . . . . . . . . . . . . 14 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓 Fn 𝑤)
11 dffn4 6575 . . . . . . . . . . . . . 14 (𝑓 Fn 𝑤𝑓:𝑤onto→ran 𝑓)
1210, 11sylib 221 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓:𝑤onto→ran 𝑓)
13 fofi 8798 . . . . . . . . . . . . 13 ((𝑤 ∈ Fin ∧ 𝑓:𝑤onto→ran 𝑓) → ran 𝑓 ∈ Fin)
149, 12, 13syl2anc 587 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓 ∈ Fin)
15 elfpw 8814 . . . . . . . . . . . 12 (ran 𝑓 ∈ (𝒫 𝑋 ∩ Fin) ↔ (ran 𝑓𝑋 ∧ ran 𝑓 ∈ Fin))
168, 14, 15sylanbrc 586 . . . . . . . . . . 11 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓 ∈ (𝒫 𝑋 ∩ Fin))
172eleq2d 2878 . . . . . . . . . . . . . . . 16 (𝑥 = (𝑓𝑏) → (𝑣 ∈ (𝑥(ball‘𝑀)𝑑) ↔ 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑)))
1817rexrn 6834 . . . . . . . . . . . . . . 15 (𝑓 Fn 𝑤 → (∃𝑥 ∈ ran 𝑓 𝑣 ∈ (𝑥(ball‘𝑀)𝑑) ↔ ∃𝑏𝑤 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑)))
1910, 18syl 17 . . . . . . . . . . . . . 14 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → (∃𝑥 ∈ ran 𝑓 𝑣 ∈ (𝑥(ball‘𝑀)𝑑) ↔ ∃𝑏𝑤 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑)))
20 eliun 4888 . . . . . . . . . . . . . 14 (𝑣 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) ↔ ∃𝑥 ∈ ran 𝑓 𝑣 ∈ (𝑥(ball‘𝑀)𝑑))
21 eliun 4888 . . . . . . . . . . . . . 14 (𝑣 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑) ↔ ∃𝑏𝑤 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑))
2219, 20, 213bitr4g 317 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → (𝑣 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) ↔ 𝑣 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑)))
2322eqrdv 2799 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) = 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑))
24 simprrr 781 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑))
25 iuneq2 4903 . . . . . . . . . . . . 13 (∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑) → 𝑏𝑤 𝑏 = 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑))
2624, 25syl 17 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑏𝑤 𝑏 = 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑))
27 uniiun 4948 . . . . . . . . . . . . 13 𝑤 = 𝑏𝑤 𝑏
28 simprl 770 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑤 = 𝑋)
2927, 28syl5eqr 2850 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑏𝑤 𝑏 = 𝑋)
3023, 26, 293eqtr2d 2842 . . . . . . . . . . 11 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) = 𝑋)
31 iuneq1 4900 . . . . . . . . . . . . 13 (𝑣 = ran 𝑓 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑))
3231eqeq1d 2803 . . . . . . . . . . . 12 (𝑣 = ran 𝑓 → ( 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) = 𝑋))
3332rspcev 3574 . . . . . . . . . . 11 ((ran 𝑓 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) = 𝑋) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)
3416, 30, 33syl2anc 587 . . . . . . . . . 10 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)
3534expr 460 . . . . . . . . 9 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ 𝑤 = 𝑋) → ((𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
3635exlimdv 1934 . . . . . . . 8 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ 𝑤 = 𝑋) → (∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
376, 36syld 47 . . . . . . 7 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ 𝑤 = 𝑋) → (∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
3837expimpd 457 . . . . . 6 ((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) → (( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
3938rexlimdva 3246 . . . . 5 (𝑀 ∈ (Met‘𝑋) → (∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) → ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
40 elfpw 8814 . . . . . . . . . . 11 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ↔ (𝑣𝑋𝑣 ∈ Fin))
4140simprbi 500 . . . . . . . . . 10 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) → 𝑣 ∈ Fin)
4241ad2antrl 727 . . . . . . . . 9 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑣 ∈ Fin)
43 mptfi 8811 . . . . . . . . 9 (𝑣 ∈ Fin → (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin)
44 rnfi 8795 . . . . . . . . 9 ((𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin → ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin)
4542, 43, 443syl 18 . . . . . . . 8 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin)
46 ovex 7172 . . . . . . . . . 10 (𝑥(ball‘𝑀)𝑑) ∈ V
4746dfiun3 5806 . . . . . . . . 9 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑))
48 simprr 772 . . . . . . . . 9 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)
4947, 48syl5eqr 2850 . . . . . . . 8 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋)
50 eqid 2801 . . . . . . . . . 10 (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑))
5150rnmpt 5795 . . . . . . . . 9 ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = {𝑏 ∣ ∃𝑥𝑣 𝑏 = (𝑥(ball‘𝑀)𝑑)}
5240simplbi 501 . . . . . . . . . . . 12 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) → 𝑣𝑋)
5352ad2antrl 727 . . . . . . . . . . 11 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑣𝑋)
54 ssrexv 3985 . . . . . . . . . . 11 (𝑣𝑋 → (∃𝑥𝑣 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)))
5553, 54syl 17 . . . . . . . . . 10 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → (∃𝑥𝑣 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)))
5655ss2abdv 3994 . . . . . . . . 9 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → {𝑏 ∣ ∃𝑥𝑣 𝑏 = (𝑥(ball‘𝑀)𝑑)} ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)})
5751, 56eqsstrid 3966 . . . . . . . 8 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)})
58 unieq 4814 . . . . . . . . . . 11 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → 𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)))
5958eqeq1d 2803 . . . . . . . . . 10 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → ( 𝑤 = 𝑋 ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋))
60 ssabral 3993 . . . . . . . . . . 11 (𝑤 ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)} ↔ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))
61 sseq1 3943 . . . . . . . . . . 11 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → (𝑤 ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)} ↔ ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)}))
6260, 61bitr3id 288 . . . . . . . . . 10 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → (∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑) ↔ ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)}))
6359, 62anbi12d 633 . . . . . . . . 9 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → (( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) ↔ ( ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋 ∧ ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)})))
6463rspcev 3574 . . . . . . . 8 ((ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin ∧ ( ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋 ∧ ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)})) → ∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)))
6545, 49, 57, 64syl12anc 835 . . . . . . 7 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → ∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)))
6665expr 460 . . . . . 6 ((𝑀 ∈ (Met‘𝑋) ∧ 𝑣 ∈ (𝒫 𝑋 ∩ Fin)) → ( 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋 → ∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))))
6766rexlimdva 3246 . . . . 5 (𝑀 ∈ (Met‘𝑋) → (∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋 → ∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))))
6839, 67impbid 215 . . . 4 (𝑀 ∈ (Met‘𝑋) → (∃𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) ↔ ∃𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
6968ralbidv 3165 . . 3 (𝑀 ∈ (Met‘𝑋) → (∀𝑑 ∈ ℝ+𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) ↔ ∀𝑑 ∈ ℝ+𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
7069pm5.32i 578 . 2 ((𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))) ↔ (𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
711, 70bitri 278 1 (𝑀 ∈ (TotBnd‘𝑋) ↔ (𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑣 ∈ (𝒫 𝑋 ∩ Fin) 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399   = wceq 1538  wex 1781  wcel 2112  {cab 2779  wral 3109  wrex 3110  cin 3883  wss 3884  𝒫 cpw 4500   cuni 4803   ciun 4884  cmpt 5113  ran crn 5524   Fn wfn 6323  wf 6324  ontowfo 6326  cfv 6328  (class class class)co 7139  Fincfn 8496  +crp 12381  Metcmet 20081  ballcbl 20082  TotBndctotbnd 35203
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-ral 3114  df-rex 3115  df-reu 3116  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-pss 3903  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-tp 4533  df-op 4535  df-uni 4804  df-int 4842  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-tr 5140  df-id 5428  df-eprel 5433  df-po 5442  df-so 5443  df-fr 5482  df-we 5484  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-pred 6120  df-ord 6166  df-on 6167  df-lim 6168  df-suc 6169  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-ov 7142  df-oprab 7143  df-mpo 7144  df-om 7565  df-1st 7675  df-2nd 7676  df-wrecs 7934  df-recs 7995  df-rdg 8033  df-1o 8089  df-oadd 8093  df-er 8276  df-en 8497  df-dom 8498  df-fin 8500  df-totbnd 35205
This theorem is referenced by:  0totbnd  35210  sstotbnd2  35211  equivtotbnd  35215  totbndbnd  35226  prdstotbnd  35231
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