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Theorem istotbnd3 33992
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 33990 . 2 (𝑀 ∈ (TotBnd‘𝑋) ↔ (𝑀 ∈ (Met‘𝑋) ∧ ∀𝑑 ∈ ℝ+𝑤 ∈ Fin ( 𝑤 = 𝑋 ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))))
2 oveq1 6849 . . . . . . . . . . . 12 (𝑥 = (𝑓𝑏) → (𝑥(ball‘𝑀)𝑑) = ((𝑓𝑏)(ball‘𝑀)𝑑))
32eqeq2d 2775 . . . . . . . . . . 11 (𝑥 = (𝑓𝑏) → (𝑏 = (𝑥(ball‘𝑀)𝑑) ↔ 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))
43ac6sfi 8411 . . . . . . . . . 10 ((𝑤 ∈ Fin ∧ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)) → ∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))
54ex 401 . . . . . . . . 9 (𝑤 ∈ Fin → (∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑) → ∃𝑓(𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑))))
65ad2antlr 718 . . . . . . . 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 799 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓:𝑤𝑋)
87frnd 6230 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓𝑋)
9 simplr 785 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑤 ∈ Fin)
107ffnd 6224 . . . . . . . . . . . . . 14 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓 Fn 𝑤)
11 dffn4 6304 . . . . . . . . . . . . . 14 (𝑓 Fn 𝑤𝑓:𝑤onto→ran 𝑓)
1210, 11sylib 209 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑓:𝑤onto→ran 𝑓)
13 fofi 8459 . . . . . . . . . . . . 13 ((𝑤 ∈ Fin ∧ 𝑓:𝑤onto→ran 𝑓) → ran 𝑓 ∈ Fin)
149, 12, 13syl2anc 579 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓 ∈ Fin)
15 elfpw 8475 . . . . . . . . . . . 12 (ran 𝑓 ∈ (𝒫 𝑋 ∩ Fin) ↔ (ran 𝑓𝑋 ∧ ran 𝑓 ∈ Fin))
168, 14, 15sylanbrc 578 . . . . . . . . . . 11 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ran 𝑓 ∈ (𝒫 𝑋 ∩ Fin))
172eleq2d 2830 . . . . . . . . . . . . . . . 16 (𝑥 = (𝑓𝑏) → (𝑣 ∈ (𝑥(ball‘𝑀)𝑑) ↔ 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑)))
1817rexrn 6551 . . . . . . . . . . . . . . 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 4680 . . . . . . . . . . . . . 14 (𝑣 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) ↔ ∃𝑥 ∈ ran 𝑓 𝑣 ∈ (𝑥(ball‘𝑀)𝑑))
21 eliun 4680 . . . . . . . . . . . . . 14 (𝑣 𝑏𝑤 ((𝑓𝑏)(ball‘𝑀)𝑑) ↔ ∃𝑏𝑤 𝑣 ∈ ((𝑓𝑏)(ball‘𝑀)𝑑))
2219, 20, 213bitr4g 305 . . . . . . . . . . . . 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 2763 . . . . . . . . . . . 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 800 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑))
25 iuneq2 4693 . . . . . . . . . . . . 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 4729 . . . . . . . . . . . . 13 𝑤 = 𝑏𝑤 𝑏
28 simprl 787 . . . . . . . . . . . . 13 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑤 = 𝑋)
2927, 28syl5eqr 2813 . . . . . . . . . . . 12 (((𝑀 ∈ (Met‘𝑋) ∧ 𝑤 ∈ Fin) ∧ ( 𝑤 = 𝑋 ∧ (𝑓:𝑤𝑋 ∧ ∀𝑏𝑤 𝑏 = ((𝑓𝑏)(ball‘𝑀)𝑑)))) → 𝑏𝑤 𝑏 = 𝑋)
3023, 26, 293eqtr2d 2805 . . . . . . . . . . 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 4690 . . . . . . . . . . . . 13 (𝑣 = ran 𝑓 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑))
3231eqeq1d 2767 . . . . . . . . . . . 12 (𝑣 = ran 𝑓 → ( 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋 𝑥 ∈ ran 𝑓(𝑥(ball‘𝑀)𝑑) = 𝑋))
3332rspcev 3461 . . . . . . . . . . 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 579 . . . . . . . . . 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 448 . . . . . . . . 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 2028 . . . . . . . 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 445 . . . . . 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 3178 . . . . 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 8475 . . . . . . . . . . 11 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ↔ (𝑣𝑋𝑣 ∈ Fin))
4140simprbi 490 . . . . . . . . . 10 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) → 𝑣 ∈ Fin)
4241ad2antrl 719 . . . . . . . . 9 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑣 ∈ Fin)
43 mptfi 8472 . . . . . . . . 9 (𝑣 ∈ Fin → (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) ∈ Fin)
44 rnfi 8456 . . . . . . . . 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 6874 . . . . . . . . . 10 (𝑥(ball‘𝑀)𝑑) ∈ V
4746dfiun3 5549 . . . . . . . . 9 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑))
48 simprr 789 . . . . . . . . 9 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)
4947, 48syl5eqr 2813 . . . . . . . 8 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋)
50 eqid 2765 . . . . . . . . . 10 (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑))
5150rnmpt 5540 . . . . . . . . 9 ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = {𝑏 ∣ ∃𝑥𝑣 𝑏 = (𝑥(ball‘𝑀)𝑑)}
5240simplbi 491 . . . . . . . . . . . 12 (𝑣 ∈ (𝒫 𝑋 ∩ Fin) → 𝑣𝑋)
5352ad2antrl 719 . . . . . . . . . . 11 ((𝑀 ∈ (Met‘𝑋) ∧ (𝑣 ∈ (𝒫 𝑋 ∩ Fin) ∧ 𝑥𝑣 (𝑥(ball‘𝑀)𝑑) = 𝑋)) → 𝑣𝑋)
54 ssrexv 3827 . . . . . . . . . . 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 3835 . . . . . . . . 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, 56syl5eqss 3809 . . . . . . . 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 4602 . . . . . . . . . . 11 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → 𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)))
5958eqeq1d 2767 . . . . . . . . . 10 (𝑤 = ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) → ( 𝑤 = 𝑋 ran (𝑥𝑣 ↦ (𝑥(ball‘𝑀)𝑑)) = 𝑋))
60 ssabral 3833 . . . . . . . . . . 11 (𝑤 ⊆ {𝑏 ∣ ∃𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑)} ↔ ∀𝑏𝑤𝑥𝑋 𝑏 = (𝑥(ball‘𝑀)𝑑))
61 sseq1 3786 . . . . . . . . . . 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, 61syl5bbr 276 . . . . . . . . . 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 624 . . . . . . . . 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 3461 . . . . . . . 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 865 . . . . . . 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 448 . . . . . 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 3178 . . . . 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 203 . . . 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 3133 . . 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 570 . 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 266 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 197  wa 384   = wceq 1652  wex 1874  wcel 2155  {cab 2751  wral 3055  wrex 3056  cin 3731  wss 3732  𝒫 cpw 4315   cuni 4594   ciun 4676  cmpt 4888  ran crn 5278   Fn wfn 6063  wf 6064  ontowfo 6066  cfv 6068  (class class class)co 6842  Fincfn 8160  +crp 12028  Metcmet 20005  ballcbl 20006  TotBndctotbnd 33987
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1890  ax-4 1904  ax-5 2005  ax-6 2070  ax-7 2105  ax-8 2157  ax-9 2164  ax-10 2183  ax-11 2198  ax-12 2211  ax-13 2352  ax-ext 2743  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147
This theorem depends on definitions:  df-bi 198  df-an 385  df-or 874  df-3or 1108  df-3an 1109  df-tru 1656  df-ex 1875  df-nf 1879  df-sb 2063  df-mo 2565  df-eu 2582  df-clab 2752  df-cleq 2758  df-clel 2761  df-nfc 2896  df-ne 2938  df-ral 3060  df-rex 3061  df-reu 3062  df-rab 3064  df-v 3352  df-sbc 3597  df-csb 3692  df-dif 3735  df-un 3737  df-in 3739  df-ss 3746  df-pss 3748  df-nul 4080  df-if 4244  df-pw 4317  df-sn 4335  df-pr 4337  df-tp 4339  df-op 4341  df-uni 4595  df-int 4634  df-iun 4678  df-br 4810  df-opab 4872  df-mpt 4889  df-tr 4912  df-id 5185  df-eprel 5190  df-po 5198  df-so 5199  df-fr 5236  df-we 5238  df-xp 5283  df-rel 5284  df-cnv 5285  df-co 5286  df-dm 5287  df-rn 5288  df-res 5289  df-ima 5290  df-pred 5865  df-ord 5911  df-on 5912  df-lim 5913  df-suc 5914  df-iota 6031  df-fun 6070  df-fn 6071  df-f 6072  df-f1 6073  df-fo 6074  df-f1o 6075  df-fv 6076  df-ov 6845  df-oprab 6846  df-mpt2 6847  df-om 7264  df-1st 7366  df-2nd 7367  df-wrecs 7610  df-recs 7672  df-rdg 7710  df-1o 7764  df-oadd 7768  df-er 7947  df-en 8161  df-dom 8162  df-fin 8164  df-totbnd 33989
This theorem is referenced by:  0totbnd  33994  sstotbnd2  33995  equivtotbnd  33999  totbndbnd  34010  prdstotbnd  34015
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