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Theorem evth 23037
Description: The Extreme Value Theorem. A continuous function from a nonempty compact topological space to the reals attains its maximum at some point in the domain. (Contributed by Mario Carneiro, 12-Aug-2014.)
Hypotheses
Ref Expression
bndth.1 𝑋 = 𝐽
bndth.2 𝐾 = (topGen‘ran (,))
bndth.3 (𝜑𝐽 ∈ Comp)
bndth.4 (𝜑𝐹 ∈ (𝐽 Cn 𝐾))
evth.5 (𝜑𝑋 ≠ ∅)
Assertion
Ref Expression
evth (𝜑 → ∃𝑥𝑋𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥))
Distinct variable groups:   𝑥,𝑦,𝐹   𝑦,𝐾   𝜑,𝑥,𝑦   𝑥,𝑋,𝑦   𝑥,𝐽,𝑦
Allowed substitution hint:   𝐾(𝑥)

Proof of Theorem evth
Dummy variable 𝑧 is distinct from all other variables.
StepHypRef Expression
1 bndth.1 . . . . 5 𝑋 = 𝐽
2 bndth.2 . . . . 5 𝐾 = (topGen‘ran (,))
3 bndth.3 . . . . . 6 (𝜑𝐽 ∈ Comp)
43adantr 472 . . . . 5 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → 𝐽 ∈ Comp)
5 cmptop 21478 . . . . . . . . . 10 (𝐽 ∈ Comp → 𝐽 ∈ Top)
64, 5syl 17 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → 𝐽 ∈ Top)
71toptopon 21001 . . . . . . . . 9 (𝐽 ∈ Top ↔ 𝐽 ∈ (TopOn‘𝑋))
86, 7sylib 209 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → 𝐽 ∈ (TopOn‘𝑋))
9 eqid 2765 . . . . . . . . . . 11 (TopOpen‘ℂfld) = (TopOpen‘ℂfld)
109cnfldtopon 22865 . . . . . . . . . 10 (TopOpen‘ℂfld) ∈ (TopOn‘ℂ)
1110a1i 11 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (TopOpen‘ℂfld) ∈ (TopOn‘ℂ))
12 1cnd 10288 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → 1 ∈ ℂ)
138, 11, 12cnmptc 21745 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ 1) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
14 bndth.4 . . . . . . . . . . . . . . . . 17 (𝜑𝐹 ∈ (𝐽 Cn 𝐾))
15 uniretop 22845 . . . . . . . . . . . . . . . . . . 19 ℝ = (topGen‘ran (,))
162unieqi 4603 . . . . . . . . . . . . . . . . . . 19 𝐾 = (topGen‘ran (,))
1715, 16eqtr4i 2790 . . . . . . . . . . . . . . . . . 18 ℝ = 𝐾
181, 17cnf 21330 . . . . . . . . . . . . . . . . 17 (𝐹 ∈ (𝐽 Cn 𝐾) → 𝐹:𝑋⟶ℝ)
1914, 18syl 17 . . . . . . . . . . . . . . . 16 (𝜑𝐹:𝑋⟶ℝ)
2019frnd 6230 . . . . . . . . . . . . . . 15 (𝜑 → ran 𝐹 ⊆ ℝ)
2119fdmd 6232 . . . . . . . . . . . . . . . . 17 (𝜑 → dom 𝐹 = 𝑋)
22 evth.5 . . . . . . . . . . . . . . . . 17 (𝜑𝑋 ≠ ∅)
2321, 22eqnetrd 3004 . . . . . . . . . . . . . . . 16 (𝜑 → dom 𝐹 ≠ ∅)
24 dm0rn0 5510 . . . . . . . . . . . . . . . . 17 (dom 𝐹 = ∅ ↔ ran 𝐹 = ∅)
2524necon3bii 2989 . . . . . . . . . . . . . . . 16 (dom 𝐹 ≠ ∅ ↔ ran 𝐹 ≠ ∅)
2623, 25sylib 209 . . . . . . . . . . . . . . 15 (𝜑 → ran 𝐹 ≠ ∅)
271, 2, 3, 14bndth 23036 . . . . . . . . . . . . . . . 16 (𝜑 → ∃𝑥 ∈ ℝ ∀𝑦𝑋 (𝐹𝑦) ≤ 𝑥)
2819ffnd 6224 . . . . . . . . . . . . . . . . . 18 (𝜑𝐹 Fn 𝑋)
29 breq1 4812 . . . . . . . . . . . . . . . . . . 19 (𝑧 = (𝐹𝑦) → (𝑧𝑥 ↔ (𝐹𝑦) ≤ 𝑥))
3029ralrn 6552 . . . . . . . . . . . . . . . . . 18 (𝐹 Fn 𝑋 → (∀𝑧 ∈ ran 𝐹 𝑧𝑥 ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ 𝑥))
3128, 30syl 17 . . . . . . . . . . . . . . . . 17 (𝜑 → (∀𝑧 ∈ ran 𝐹 𝑧𝑥 ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ 𝑥))
3231rexbidv 3199 . . . . . . . . . . . . . . . 16 (𝜑 → (∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥 ↔ ∃𝑥 ∈ ℝ ∀𝑦𝑋 (𝐹𝑦) ≤ 𝑥))
3327, 32mpbird 248 . . . . . . . . . . . . . . 15 (𝜑 → ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥)
3420, 26, 333jca 1158 . . . . . . . . . . . . . 14 (𝜑 → (ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥))
35 suprcl 11237 . . . . . . . . . . . . . 14 ((ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥) → sup(ran 𝐹, ℝ, < ) ∈ ℝ)
3634, 35syl 17 . . . . . . . . . . . . 13 (𝜑 → sup(ran 𝐹, ℝ, < ) ∈ ℝ)
3736recnd 10322 . . . . . . . . . . . 12 (𝜑 → sup(ran 𝐹, ℝ, < ) ∈ ℂ)
3837adantr 472 . . . . . . . . . . 11 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → sup(ran 𝐹, ℝ, < ) ∈ ℂ)
398, 11, 38cnmptc 21745 . . . . . . . . . 10 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ sup(ran 𝐹, ℝ, < )) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
4019feqmptd 6438 . . . . . . . . . . . 12 (𝜑𝐹 = (𝑧𝑋 ↦ (𝐹𝑧)))
419cnfldtop 22866 . . . . . . . . . . . . . 14 (TopOpen‘ℂfld) ∈ Top
42 cnrest2r 21371 . . . . . . . . . . . . . 14 ((TopOpen‘ℂfld) ∈ Top → (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ)) ⊆ (𝐽 Cn (TopOpen‘ℂfld)))
4341, 42ax-mp 5 . . . . . . . . . . . . 13 (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ)) ⊆ (𝐽 Cn (TopOpen‘ℂfld))
449tgioo2 22885 . . . . . . . . . . . . . . . 16 (topGen‘ran (,)) = ((TopOpen‘ℂfld) ↾t ℝ)
452, 44eqtri 2787 . . . . . . . . . . . . . . 15 𝐾 = ((TopOpen‘ℂfld) ↾t ℝ)
4645oveq2i 6853 . . . . . . . . . . . . . 14 (𝐽 Cn 𝐾) = (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ))
4714, 46syl6eleq 2854 . . . . . . . . . . . . 13 (𝜑𝐹 ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ)))
4843, 47sseldi 3759 . . . . . . . . . . . 12 (𝜑𝐹 ∈ (𝐽 Cn (TopOpen‘ℂfld)))
4940, 48eqeltrrd 2845 . . . . . . . . . . 11 (𝜑 → (𝑧𝑋 ↦ (𝐹𝑧)) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
5049adantr 472 . . . . . . . . . 10 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (𝐹𝑧)) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
519subcn 22948 . . . . . . . . . . 11 − ∈ (((TopOpen‘ℂfld) ×t (TopOpen‘ℂfld)) Cn (TopOpen‘ℂfld))
5251a1i 11 . . . . . . . . . 10 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → − ∈ (((TopOpen‘ℂfld) ×t (TopOpen‘ℂfld)) Cn (TopOpen‘ℂfld)))
538, 39, 50, 52cnmpt12f 21749 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
5436ad2antrr 717 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → sup(ran 𝐹, ℝ, < ) ∈ ℝ)
55 ffvelrn 6547 . . . . . . . . . . . . . . . . . 18 ((𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ∧ 𝑧𝑋) → (𝐹𝑧) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}))
5655adantll 705 . . . . . . . . . . . . . . . . 17 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (𝐹𝑧) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}))
57 eldifsn 4472 . . . . . . . . . . . . . . . . 17 ((𝐹𝑧) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ ((𝐹𝑧) ∈ ℝ ∧ (𝐹𝑧) ≠ sup(ran 𝐹, ℝ, < )))
5856, 57sylib 209 . . . . . . . . . . . . . . . 16 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → ((𝐹𝑧) ∈ ℝ ∧ (𝐹𝑧) ≠ sup(ran 𝐹, ℝ, < )))
5958simpld 488 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (𝐹𝑧) ∈ ℝ)
6054, 59resubcld 10712 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ∈ ℝ)
6160recnd 10322 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ∈ ℂ)
6254recnd 10322 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → sup(ran 𝐹, ℝ, < ) ∈ ℂ)
6359recnd 10322 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (𝐹𝑧) ∈ ℂ)
6458simprd 489 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (𝐹𝑧) ≠ sup(ran 𝐹, ℝ, < ))
6564necomd 2992 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → sup(ran 𝐹, ℝ, < ) ≠ (𝐹𝑧))
6662, 63, 65subne0d 10655 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ≠ 0)
67 eldifsn 4472 . . . . . . . . . . . . 13 ((sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ∈ (ℂ ∖ {0}) ↔ ((sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ∈ ℂ ∧ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ≠ 0))
6861, 66, 67sylanbrc 578 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) ∈ (ℂ ∖ {0}))
6968fmpttd 6575 . . . . . . . . . . 11 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))):𝑋⟶(ℂ ∖ {0}))
7069frnd 6230 . . . . . . . . . 10 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ran (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ⊆ (ℂ ∖ {0}))
71 difssd 3900 . . . . . . . . . 10 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (ℂ ∖ {0}) ⊆ ℂ)
72 cnrest2 21370 . . . . . . . . . 10 (((TopOpen‘ℂfld) ∈ (TopOn‘ℂ) ∧ ran (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ⊆ (ℂ ∖ {0}) ∧ (ℂ ∖ {0}) ⊆ ℂ) → ((𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn (TopOpen‘ℂfld)) ↔ (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0})))))
7311, 70, 71, 72syl3anc 1490 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ((𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn (TopOpen‘ℂfld)) ↔ (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0})))))
7453, 73mpbid 223 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0}))))
75 eqid 2765 . . . . . . . . . 10 ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0})) = ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0}))
769, 75divcn 22950 . . . . . . . . 9 / ∈ (((TopOpen‘ℂfld) ×t ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0}))) Cn (TopOpen‘ℂfld))
7776a1i 11 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → / ∈ (((TopOpen‘ℂfld) ×t ((TopOpen‘ℂfld) ↾t (ℂ ∖ {0}))) Cn (TopOpen‘ℂfld)))
788, 13, 74, 77cnmpt12f 21749 . . . . . . 7 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn (TopOpen‘ℂfld)))
7960, 66rereccld 11106 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑧𝑋) → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) ∈ ℝ)
8079fmpttd 6575 . . . . . . . . 9 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))):𝑋⟶ℝ)
8180frnd 6230 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ran (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ⊆ ℝ)
82 ax-resscn 10246 . . . . . . . . 9 ℝ ⊆ ℂ
8382a1i 11 . . . . . . . 8 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ℝ ⊆ ℂ)
84 cnrest2 21370 . . . . . . . 8 (((TopOpen‘ℂfld) ∈ (TopOn‘ℂ) ∧ ran (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ⊆ ℝ ∧ ℝ ⊆ ℂ) → ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn (TopOpen‘ℂfld)) ↔ (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ))))
8511, 81, 83, 84syl3anc 1490 . . . . . . 7 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn (TopOpen‘ℂfld)) ↔ (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ))))
8678, 85mpbid 223 . . . . . 6 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn ((TopOpen‘ℂfld) ↾t ℝ)))
8786, 46syl6eleqr 2855 . . . . 5 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) ∈ (𝐽 Cn 𝐾))
881, 2, 4, 87bndth 23036 . . . 4 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ∃𝑥 ∈ ℝ ∀𝑦𝑋 ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥)
8936ad2antrr 717 . . . . . . . 8 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → sup(ran 𝐹, ℝ, < ) ∈ ℝ)
90 simpr 477 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 𝑥 ∈ ℝ)
91 1re 10293 . . . . . . . . . . 11 1 ∈ ℝ
92 ifcl 4287 . . . . . . . . . . 11 ((𝑥 ∈ ℝ ∧ 1 ∈ ℝ) → if(1 ≤ 𝑥, 𝑥, 1) ∈ ℝ)
9390, 91, 92sylancl 580 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → if(1 ≤ 𝑥, 𝑥, 1) ∈ ℝ)
94 0red 10297 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 0 ∈ ℝ)
9591a1i 11 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 1 ∈ ℝ)
96 0lt1 10804 . . . . . . . . . . . . 13 0 < 1
9796a1i 11 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 0 < 1)
98 max1 12218 . . . . . . . . . . . . 13 ((1 ∈ ℝ ∧ 𝑥 ∈ ℝ) → 1 ≤ if(1 ≤ 𝑥, 𝑥, 1))
9991, 90, 98sylancr 581 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 1 ≤ if(1 ≤ 𝑥, 𝑥, 1))
10094, 95, 93, 97, 99ltletrd 10451 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 0 < if(1 ≤ 𝑥, 𝑥, 1))
101100gt0ne0d 10846 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → if(1 ≤ 𝑥, 𝑥, 1) ≠ 0)
10293, 101rereccld 11106 . . . . . . . . 9 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (1 / if(1 ≤ 𝑥, 𝑥, 1)) ∈ ℝ)
10393, 100recgt0d 11212 . . . . . . . . 9 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 0 < (1 / if(1 ≤ 𝑥, 𝑥, 1)))
104102, 103elrpd 12067 . . . . . . . 8 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (1 / if(1 ≤ 𝑥, 𝑥, 1)) ∈ ℝ+)
10589, 104ltsubrpd 12102 . . . . . . 7 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) < sup(ran 𝐹, ℝ, < ))
10689, 102resubcld 10712 . . . . . . . 8 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ∈ ℝ)
107106, 89ltnled 10438 . . . . . . 7 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → ((sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) < sup(ran 𝐹, ℝ, < ) ↔ ¬ sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
108105, 107mpbid 223 . . . . . 6 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → ¬ sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))))
109 simprl 787 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → 𝑥 ∈ ℝ)
110 max2 12220 . . . . . . . . . . . 12 ((1 ∈ ℝ ∧ 𝑥 ∈ ℝ) → 𝑥 ≤ if(1 ≤ 𝑥, 𝑥, 1))
11191, 109, 110sylancr 581 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → 𝑥 ≤ if(1 ≤ 𝑥, 𝑥, 1))
11236ad2antrr 717 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → sup(ran 𝐹, ℝ, < ) ∈ ℝ)
113 ffvelrn 6547 . . . . . . . . . . . . . . . . 17 ((𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ∧ 𝑦𝑋) → (𝐹𝑦) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}))
114113ad2ant2l 752 . . . . . . . . . . . . . . . 16 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (𝐹𝑦) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}))
115 eldifsn 4472 . . . . . . . . . . . . . . . 16 ((𝐹𝑦) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ ((𝐹𝑦) ∈ ℝ ∧ (𝐹𝑦) ≠ sup(ran 𝐹, ℝ, < )))
116114, 115sylib 209 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((𝐹𝑦) ∈ ℝ ∧ (𝐹𝑦) ≠ sup(ran 𝐹, ℝ, < )))
117116simpld 488 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (𝐹𝑦) ∈ ℝ)
118112, 117resubcld 10712 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ∈ ℝ)
11934adantr 472 . . . . . . . . . . . . . . . . . 18 ((𝜑𝑦𝑋) → (ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥))
120 fnfvelrn 6546 . . . . . . . . . . . . . . . . . . 19 ((𝐹 Fn 𝑋𝑦𝑋) → (𝐹𝑦) ∈ ran 𝐹)
12128, 120sylan 575 . . . . . . . . . . . . . . . . . 18 ((𝜑𝑦𝑋) → (𝐹𝑦) ∈ ran 𝐹)
122 suprub 11238 . . . . . . . . . . . . . . . . . 18 (((ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥) ∧ (𝐹𝑦) ∈ ran 𝐹) → (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < ))
123119, 121, 122syl2anc 579 . . . . . . . . . . . . . . . . 17 ((𝜑𝑦𝑋) → (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < ))
124123ad2ant2rl 755 . . . . . . . . . . . . . . . 16 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < ))
125116simprd 489 . . . . . . . . . . . . . . . . 17 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (𝐹𝑦) ≠ sup(ran 𝐹, ℝ, < ))
126125necomd 2992 . . . . . . . . . . . . . . . 16 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → sup(ran 𝐹, ℝ, < ) ≠ (𝐹𝑦))
127117, 112ltlend 10436 . . . . . . . . . . . . . . . 16 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((𝐹𝑦) < sup(ran 𝐹, ℝ, < ) ↔ ((𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < ) ∧ sup(ran 𝐹, ℝ, < ) ≠ (𝐹𝑦))))
128124, 126, 127mpbir2and 704 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (𝐹𝑦) < sup(ran 𝐹, ℝ, < ))
129117, 112posdifd 10868 . . . . . . . . . . . . . . 15 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((𝐹𝑦) < sup(ran 𝐹, ℝ, < ) ↔ 0 < (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))))
130128, 129mpbid 223 . . . . . . . . . . . . . 14 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → 0 < (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)))
131130gt0ne0d 10846 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ≠ 0)
132118, 131rereccld 11106 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ∈ ℝ)
133109, 91, 92sylancl 580 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → if(1 ≤ 𝑥, 𝑥, 1) ∈ ℝ)
134 letr 10385 . . . . . . . . . . . 12 (((1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ∈ ℝ ∧ 𝑥 ∈ ℝ ∧ if(1 ≤ 𝑥, 𝑥, 1) ∈ ℝ) → (((1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ 𝑥𝑥 ≤ if(1 ≤ 𝑥, 𝑥, 1)) → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ if(1 ≤ 𝑥, 𝑥, 1)))
135132, 109, 133, 134syl3anc 1490 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (((1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ 𝑥𝑥 ≤ if(1 ≤ 𝑥, 𝑥, 1)) → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ if(1 ≤ 𝑥, 𝑥, 1)))
136111, 135mpan2d 685 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ 𝑥 → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ if(1 ≤ 𝑥, 𝑥, 1)))
137 fveq2 6375 . . . . . . . . . . . . . . 15 (𝑧 = 𝑦 → (𝐹𝑧) = (𝐹𝑦))
138137oveq2d 6858 . . . . . . . . . . . . . 14 (𝑧 = 𝑦 → (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)) = (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)))
139138oveq2d 6858 . . . . . . . . . . . . 13 (𝑧 = 𝑦 → (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))) = (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))))
140 eqid 2765 . . . . . . . . . . . . 13 (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧)))) = (𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))
141 ovex 6874 . . . . . . . . . . . . 13 (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ∈ V
142139, 140, 141fvmpt 6471 . . . . . . . . . . . 12 (𝑦𝑋 → ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) = (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))))
143142breq1d 4819 . . . . . . . . . . 11 (𝑦𝑋 → (((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ 𝑥))
144143ad2antll 720 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ 𝑥))
145102adantrr 708 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (1 / if(1 ≤ 𝑥, 𝑥, 1)) ∈ ℝ)
146100adantrr 708 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → 0 < if(1 ≤ 𝑥, 𝑥, 1))
147133, 146recgt0d 11212 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → 0 < (1 / if(1 ≤ 𝑥, 𝑥, 1)))
148 lerec 11160 . . . . . . . . . . . 12 ((((1 / if(1 ≤ 𝑥, 𝑥, 1)) ∈ ℝ ∧ 0 < (1 / if(1 ≤ 𝑥, 𝑥, 1))) ∧ ((sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ∈ ℝ ∧ 0 < (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)))) → ((1 / if(1 ≤ 𝑥, 𝑥, 1)) ≤ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ (1 / (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
149145, 147, 118, 130, 148syl22anc 867 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((1 / if(1 ≤ 𝑥, 𝑥, 1)) ≤ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ (1 / (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
150 lesub 10761 . . . . . . . . . . . 12 (((1 / if(1 ≤ 𝑥, 𝑥, 1)) ∈ ℝ ∧ sup(ran 𝐹, ℝ, < ) ∈ ℝ ∧ (𝐹𝑦) ∈ ℝ) → ((1 / if(1 ≤ 𝑥, 𝑥, 1)) ≤ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ↔ (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
151145, 112, 117, 150syl3anc 1490 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((1 / if(1 ≤ 𝑥, 𝑥, 1)) ≤ (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦)) ↔ (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
152133recnd 10322 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → if(1 ≤ 𝑥, 𝑥, 1) ∈ ℂ)
153101adantrr 708 . . . . . . . . . . . . 13 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → if(1 ≤ 𝑥, 𝑥, 1) ≠ 0)
154152, 153recrecd 11052 . . . . . . . . . . . 12 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (1 / (1 / if(1 ≤ 𝑥, 𝑥, 1))) = if(1 ≤ 𝑥, 𝑥, 1))
155154breq2d 4821 . . . . . . . . . . 11 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ (1 / (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ if(1 ≤ 𝑥, 𝑥, 1)))
156149, 151, 1553bitr3d 300 . . . . . . . . . 10 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → ((𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑦))) ≤ if(1 ≤ 𝑥, 𝑥, 1)))
157136, 144, 1563imtr4d 285 . . . . . . . . 9 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ (𝑥 ∈ ℝ ∧ 𝑦𝑋)) → (((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 → (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
158157anassrs 459 . . . . . . . 8 ((((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) ∧ 𝑦𝑋) → (((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 → (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
159158ralimdva 3109 . . . . . . 7 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (∀𝑦𝑋 ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 → ∀𝑦𝑋 (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
16034ad2antrr 717 . . . . . . . . 9 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥))
161 suprleub 11243 . . . . . . . . 9 (((ran 𝐹 ⊆ ℝ ∧ ran 𝐹 ≠ ∅ ∧ ∃𝑥 ∈ ℝ ∀𝑧 ∈ ran 𝐹 𝑧𝑥) ∧ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ∈ ℝ) → (sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ ∀𝑧 ∈ ran 𝐹 𝑧 ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
162160, 106, 161syl2anc 579 . . . . . . . 8 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ ∀𝑧 ∈ ran 𝐹 𝑧 ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
16328ad2antrr 717 . . . . . . . . 9 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → 𝐹 Fn 𝑋)
164 breq1 4812 . . . . . . . . . 10 (𝑧 = (𝐹𝑦) → (𝑧 ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
165164ralrn 6552 . . . . . . . . 9 (𝐹 Fn 𝑋 → (∀𝑧 ∈ ran 𝐹 𝑧 ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
166163, 165syl 17 . . . . . . . 8 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (∀𝑧 ∈ ran 𝐹 𝑧 ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
167162, 166bitrd 270 . . . . . . 7 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1))) ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
168159, 167sylibrd 250 . . . . . 6 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → (∀𝑦𝑋 ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥 → sup(ran 𝐹, ℝ, < ) ≤ (sup(ran 𝐹, ℝ, < ) − (1 / if(1 ≤ 𝑥, 𝑥, 1)))))
169108, 168mtod 189 . . . . 5 (((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) ∧ 𝑥 ∈ ℝ) → ¬ ∀𝑦𝑋 ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥)
170169nrexdv 3147 . . . 4 ((𝜑𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})) → ¬ ∃𝑥 ∈ ℝ ∀𝑦𝑋 ((𝑧𝑋 ↦ (1 / (sup(ran 𝐹, ℝ, < ) − (𝐹𝑧))))‘𝑦) ≤ 𝑥)
17188, 170pm2.65da 851 . . 3 (𝜑 → ¬ 𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}))
172123ralrimiva 3113 . . . . . . . . 9 (𝜑 → ∀𝑦𝑋 (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < ))
173 breq2 4813 . . . . . . . . . 10 ((𝐹𝑥) = sup(ran 𝐹, ℝ, < ) → ((𝐹𝑦) ≤ (𝐹𝑥) ↔ (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < )))
174173ralbidv 3133 . . . . . . . . 9 ((𝐹𝑥) = sup(ran 𝐹, ℝ, < ) → (∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) ↔ ∀𝑦𝑋 (𝐹𝑦) ≤ sup(ran 𝐹, ℝ, < )))
175172, 174syl5ibrcom 238 . . . . . . . 8 (𝜑 → ((𝐹𝑥) = sup(ran 𝐹, ℝ, < ) → ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥)))
176175necon3bd 2951 . . . . . . 7 (𝜑 → (¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) → (𝐹𝑥) ≠ sup(ran 𝐹, ℝ, < )))
177176adantr 472 . . . . . 6 ((𝜑𝑥𝑋) → (¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) → (𝐹𝑥) ≠ sup(ran 𝐹, ℝ, < )))
17819ffvelrnda 6549 . . . . . . 7 ((𝜑𝑥𝑋) → (𝐹𝑥) ∈ ℝ)
179 eldifsn 4472 . . . . . . . 8 ((𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ ((𝐹𝑥) ∈ ℝ ∧ (𝐹𝑥) ≠ sup(ran 𝐹, ℝ, < )))
180179baib 531 . . . . . . 7 ((𝐹𝑥) ∈ ℝ → ((𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ (𝐹𝑥) ≠ sup(ran 𝐹, ℝ, < )))
181178, 180syl 17 . . . . . 6 ((𝜑𝑥𝑋) → ((𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ (𝐹𝑥) ≠ sup(ran 𝐹, ℝ, < )))
182177, 181sylibrd 250 . . . . 5 ((𝜑𝑥𝑋) → (¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) → (𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
183182ralimdva 3109 . . . 4 (𝜑 → (∀𝑥𝑋 ¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) → ∀𝑥𝑋 (𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
184 ffnfv 6578 . . . . . 6 (𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ (𝐹 Fn 𝑋 ∧ ∀𝑥𝑋 (𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
185184baib 531 . . . . 5 (𝐹 Fn 𝑋 → (𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ ∀𝑥𝑋 (𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
18628, 185syl 17 . . . 4 (𝜑 → (𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )}) ↔ ∀𝑥𝑋 (𝐹𝑥) ∈ (ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
187183, 186sylibrd 250 . . 3 (𝜑 → (∀𝑥𝑋 ¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) → 𝐹:𝑋⟶(ℝ ∖ {sup(ran 𝐹, ℝ, < )})))
188171, 187mtod 189 . 2 (𝜑 → ¬ ∀𝑥𝑋 ¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥))
189 dfrex2 3142 . 2 (∃𝑥𝑋𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥) ↔ ¬ ∀𝑥𝑋 ¬ ∀𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥))
190188, 189sylibr 225 1 (𝜑 → ∃𝑥𝑋𝑦𝑋 (𝐹𝑦) ≤ (𝐹𝑥))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 197  wa 384  w3a 1107   = wceq 1652  wcel 2155  wne 2937  wral 3055  wrex 3056  cdif 3729  wss 3732  c0 4079  ifcif 4243  {csn 4334   cuni 4594   class class class wbr 4809  cmpt 4888  dom cdm 5277  ran crn 5278   Fn wfn 6063  wf 6064  cfv 6068  (class class class)co 6842  supcsup 8553  cc 10187  cr 10188  0cc0 10189  1c1 10190   < clt 10328  cle 10329  cmin 10520   / cdiv 10938  (,)cioo 12377  t crest 16349  TopOpenctopn 16350  topGenctg 16366  fldccnfld 20019  Topctop 20977  TopOnctopon 20994   Cn ccn 21308  Compccmp 21469   ×t ctx 21643
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-rep 4930  ax-sep 4941  ax-nul 4949  ax-pow 5001  ax-pr 5062  ax-un 7147  ax-inf2 8753  ax-cnex 10245  ax-resscn 10246  ax-1cn 10247  ax-icn 10248  ax-addcl 10249  ax-addrcl 10250  ax-mulcl 10251  ax-mulrcl 10252  ax-mulcom 10253  ax-addass 10254  ax-mulass 10255  ax-distr 10256  ax-i2m1 10257  ax-1ne0 10258  ax-1rid 10259  ax-rnegex 10260  ax-rrecex 10261  ax-cnre 10262  ax-pre-lttri 10263  ax-pre-lttrn 10264  ax-pre-ltadd 10265  ax-pre-mulgt0 10266  ax-pre-sup 10267  ax-mulf 10269
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-nel 3041  df-ral 3060  df-rex 3061  df-reu 3062  df-rmo 3063  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-iin 4679  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-se 5237  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-isom 6077  df-riota 6803  df-ov 6845  df-oprab 6846  df-mpt2 6847  df-of 7095  df-om 7264  df-1st 7366  df-2nd 7367  df-supp 7498  df-wrecs 7610  df-recs 7672  df-rdg 7710  df-1o 7764  df-2o 7765  df-oadd 7768  df-er 7947  df-map 8062  df-ixp 8114  df-en 8161  df-dom 8162  df-sdom 8163  df-fin 8164  df-fsupp 8483  df-fi 8524  df-sup 8555  df-inf 8556  df-oi 8622  df-card 9016  df-cda 9243  df-pnf 10330  df-mnf 10331  df-xr 10332  df-ltxr 10333  df-le 10334  df-sub 10522  df-neg 10523  df-div 10939  df-nn 11275  df-2 11335  df-3 11336  df-4 11337  df-5 11338  df-6 11339  df-7 11340  df-8 11341  df-9 11342  df-n0 11539  df-z 11625  df-dec 11741  df-uz 11887  df-q 11990  df-rp 12029  df-xneg 12146  df-xadd 12147  df-xmul 12148  df-ioo 12381  df-icc 12384  df-fz 12534  df-fzo 12674  df-seq 13009  df-exp 13068  df-hash 13322  df-cj 14126  df-re 14127  df-im 14128  df-sqrt 14262  df-abs 14263  df-struct 16134  df-ndx 16135  df-slot 16136  df-base 16138  df-sets 16139  df-ress 16140  df-plusg 16229  df-mulr 16230  df-starv 16231  df-sca 16232  df-vsca 16233  df-ip 16234  df-tset 16235  df-ple 16236  df-ds 16238  df-unif 16239  df-hom 16240  df-cco 16241  df-rest 16351  df-topn 16352  df-0g 16370  df-gsum 16371  df-topgen 16372  df-pt 16373  df-prds 16376  df-xrs 16430  df-qtop 16435  df-imas 16436  df-xps 16438  df-mre 16514  df-mrc 16515  df-acs 16517  df-mgm 17510  df-sgrp 17552  df-mnd 17563  df-submnd 17604  df-mulg 17810  df-cntz 18015  df-cmn 18461  df-psmet 20011  df-xmet 20012  df-met 20013  df-bl 20014  df-mopn 20015  df-cnfld 20020  df-top 20978  df-topon 20995  df-topsp 21017  df-bases 21030  df-cn 21311  df-cnp 21312  df-cmp 21470  df-tx 21645  df-hmeo 21838  df-xms 22404  df-ms 22405  df-tms 22406
This theorem is referenced by:  evth2  23038  evthicc  23517  evthf  39770  cncmpmax  39775
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