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Theorem fimaxre2 11168
Description: A nonempty finite set of real numbers has an upper bound. (Contributed by Jeff Madsen, 27-May-2011.) (Revised by Mario Carneiro, 13-Feb-2014.)
Assertion
Ref Expression
fimaxre2 ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) → ∃𝑥 ∈ ℝ ∀𝑦𝐴 𝑦𝑥)
Distinct variable group:   𝑥,𝐴,𝑦

Proof of Theorem fimaxre2
Dummy variables 𝑠 𝑢 𝑣 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 sseq1 3165 . . . 4 (𝑤 = ∅ → (𝑤 ⊆ ℝ ↔ ∅ ⊆ ℝ))
2 raleq 2661 . . . . 5 (𝑤 = ∅ → (∀𝑦𝑤 𝑦𝑥 ↔ ∀𝑦 ∈ ∅ 𝑦𝑥))
32rexbidv 2467 . . . 4 (𝑤 = ∅ → (∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥 ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ ∅ 𝑦𝑥))
41, 3imbi12d 233 . . 3 (𝑤 = ∅ → ((𝑤 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥) ↔ (∅ ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ∅ 𝑦𝑥)))
5 sseq1 3165 . . . 4 (𝑤 = 𝑢 → (𝑤 ⊆ ℝ ↔ 𝑢 ⊆ ℝ))
6 raleq 2661 . . . . 5 (𝑤 = 𝑢 → (∀𝑦𝑤 𝑦𝑥 ↔ ∀𝑦𝑢 𝑦𝑥))
76rexbidv 2467 . . . 4 (𝑤 = 𝑢 → (∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥 ↔ ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥))
85, 7imbi12d 233 . . 3 (𝑤 = 𝑢 → ((𝑤 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥) ↔ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)))
9 sseq1 3165 . . . 4 (𝑤 = (𝑢 ∪ {𝑣}) → (𝑤 ⊆ ℝ ↔ (𝑢 ∪ {𝑣}) ⊆ ℝ))
10 raleq 2661 . . . . 5 (𝑤 = (𝑢 ∪ {𝑣}) → (∀𝑦𝑤 𝑦𝑥 ↔ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥))
1110rexbidv 2467 . . . 4 (𝑤 = (𝑢 ∪ {𝑣}) → (∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥 ↔ ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥))
129, 11imbi12d 233 . . 3 (𝑤 = (𝑢 ∪ {𝑣}) → ((𝑤 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥) ↔ ((𝑢 ∪ {𝑣}) ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥)))
13 sseq1 3165 . . . 4 (𝑤 = 𝐴 → (𝑤 ⊆ ℝ ↔ 𝐴 ⊆ ℝ))
14 raleq 2661 . . . . 5 (𝑤 = 𝐴 → (∀𝑦𝑤 𝑦𝑥 ↔ ∀𝑦𝐴 𝑦𝑥))
1514rexbidv 2467 . . . 4 (𝑤 = 𝐴 → (∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥 ↔ ∃𝑥 ∈ ℝ ∀𝑦𝐴 𝑦𝑥))
1613, 15imbi12d 233 . . 3 (𝑤 = 𝐴 → ((𝑤 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑤 𝑦𝑥) ↔ (𝐴 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝐴 𝑦𝑥)))
17 0re 7899 . . . . 5 0 ∈ ℝ
18 ral0 3510 . . . . 5 𝑦 ∈ ∅ 𝑦 ≤ 0
19 breq2 3986 . . . . . . 7 (𝑥 = 0 → (𝑦𝑥𝑦 ≤ 0))
2019ralbidv 2466 . . . . . 6 (𝑥 = 0 → (∀𝑦 ∈ ∅ 𝑦𝑥 ↔ ∀𝑦 ∈ ∅ 𝑦 ≤ 0))
2120rspcev 2830 . . . . 5 ((0 ∈ ℝ ∧ ∀𝑦 ∈ ∅ 𝑦 ≤ 0) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ∅ 𝑦𝑥)
2217, 18, 21mp2an 423 . . . 4 𝑥 ∈ ℝ ∀𝑦 ∈ ∅ 𝑦𝑥
2322a1i 9 . . 3 (∅ ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ ∅ 𝑦𝑥)
24 unss 3296 . . . . . . . . . 10 ((𝑢 ⊆ ℝ ∧ {𝑣} ⊆ ℝ) ↔ (𝑢 ∪ {𝑣}) ⊆ ℝ)
2524biimpri 132 . . . . . . . . 9 ((𝑢 ∪ {𝑣}) ⊆ ℝ → (𝑢 ⊆ ℝ ∧ {𝑣} ⊆ ℝ))
2625simpld 111 . . . . . . . 8 ((𝑢 ∪ {𝑣}) ⊆ ℝ → 𝑢 ⊆ ℝ)
2726adantl 275 . . . . . . 7 (((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) → 𝑢 ⊆ ℝ)
28 simplr 520 . . . . . . 7 (((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) → (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥))
2927, 28mpd 13 . . . . . 6 (((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)
30 breq2 3986 . . . . . . . 8 (𝑥 = 𝑠 → (𝑦𝑥𝑦𝑠))
3130ralbidv 2466 . . . . . . 7 (𝑥 = 𝑠 → (∀𝑦𝑢 𝑦𝑥 ↔ ∀𝑦𝑢 𝑦𝑠))
3231cbvrexv 2693 . . . . . 6 (∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥 ↔ ∃𝑠 ∈ ℝ ∀𝑦𝑢 𝑦𝑠)
3329, 32sylib 121 . . . . 5 (((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) → ∃𝑠 ∈ ℝ ∀𝑦𝑢 𝑦𝑠)
34 simprl 521 . . . . . . 7 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → 𝑠 ∈ ℝ)
3525simprd 113 . . . . . . . . 9 ((𝑢 ∪ {𝑣}) ⊆ ℝ → {𝑣} ⊆ ℝ)
36 vex 2729 . . . . . . . . . 10 𝑣 ∈ V
3736snss 3702 . . . . . . . . 9 (𝑣 ∈ ℝ ↔ {𝑣} ⊆ ℝ)
3835, 37sylibr 133 . . . . . . . 8 ((𝑢 ∪ {𝑣}) ⊆ ℝ → 𝑣 ∈ ℝ)
3938ad2antlr 481 . . . . . . 7 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → 𝑣 ∈ ℝ)
40 maxcl 11152 . . . . . . 7 ((𝑠 ∈ ℝ ∧ 𝑣 ∈ ℝ) → sup({𝑠, 𝑣}, ℝ, < ) ∈ ℝ)
4134, 39, 40syl2anc 409 . . . . . 6 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → sup({𝑠, 𝑣}, ℝ, < ) ∈ ℝ)
42 nfv 1516 . . . . . . . . . . 11 𝑦 𝑢 ∈ Fin
43 nfv 1516 . . . . . . . . . . . 12 𝑦 𝑢 ⊆ ℝ
44 nfcv 2308 . . . . . . . . . . . . 13 𝑦
45 nfra1 2497 . . . . . . . . . . . . 13 𝑦𝑦𝑢 𝑦𝑥
4644, 45nfrexxy 2505 . . . . . . . . . . . 12 𝑦𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥
4743, 46nfim 1560 . . . . . . . . . . 11 𝑦(𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)
4842, 47nfan 1553 . . . . . . . . . 10 𝑦(𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥))
49 nfv 1516 . . . . . . . . . 10 𝑦(𝑢 ∪ {𝑣}) ⊆ ℝ
5048, 49nfan 1553 . . . . . . . . 9 𝑦((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ)
51 nfv 1516 . . . . . . . . . 10 𝑦 𝑠 ∈ ℝ
52 nfra1 2497 . . . . . . . . . 10 𝑦𝑦𝑢 𝑦𝑠
5351, 52nfan 1553 . . . . . . . . 9 𝑦(𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)
5450, 53nfan 1553 . . . . . . . 8 𝑦(((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠))
55 simprr 522 . . . . . . . . . . . 12 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∀𝑦𝑢 𝑦𝑠)
56 maxle1 11153 . . . . . . . . . . . . 13 ((𝑠 ∈ ℝ ∧ 𝑣 ∈ ℝ) → 𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < ))
5734, 39, 56syl2anc 409 . . . . . . . . . . . 12 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → 𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < ))
58 r19.27av 2601 . . . . . . . . . . . 12 ((∀𝑦𝑢 𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )) → ∀𝑦𝑢 (𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )))
5955, 57, 58syl2anc 409 . . . . . . . . . . 11 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∀𝑦𝑢 (𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )))
6059r19.21bi 2554 . . . . . . . . . 10 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → (𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )))
6127ad2antrr 480 . . . . . . . . . . . 12 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → 𝑢 ⊆ ℝ)
62 simpr 109 . . . . . . . . . . . 12 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → 𝑦𝑢)
6361, 62sseldd 3143 . . . . . . . . . . 11 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → 𝑦 ∈ ℝ)
6434adantr 274 . . . . . . . . . . 11 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → 𝑠 ∈ ℝ)
6541adantr 274 . . . . . . . . . . 11 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → sup({𝑠, 𝑣}, ℝ, < ) ∈ ℝ)
66 letr 7981 . . . . . . . . . . 11 ((𝑦 ∈ ℝ ∧ 𝑠 ∈ ℝ ∧ sup({𝑠, 𝑣}, ℝ, < ) ∈ ℝ) → ((𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )) → 𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )))
6763, 64, 65, 66syl3anc 1228 . . . . . . . . . 10 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → ((𝑦𝑠𝑠 ≤ sup({𝑠, 𝑣}, ℝ, < )) → 𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )))
6860, 67mpd 13 . . . . . . . . 9 (((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) ∧ 𝑦𝑢) → 𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ))
6968ex 114 . . . . . . . 8 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → (𝑦𝑢𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )))
7054, 69ralrimi 2537 . . . . . . 7 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∀𝑦𝑢 𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ))
71 maxle2 11154 . . . . . . . . 9 ((𝑠 ∈ ℝ ∧ 𝑣 ∈ ℝ) → 𝑣 ≤ sup({𝑠, 𝑣}, ℝ, < ))
7234, 39, 71syl2anc 409 . . . . . . . 8 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → 𝑣 ≤ sup({𝑠, 𝑣}, ℝ, < ))
73 breq1 3985 . . . . . . . . . 10 (𝑦 = 𝑣 → (𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ) ↔ 𝑣 ≤ sup({𝑠, 𝑣}, ℝ, < )))
7473ralsng 3616 . . . . . . . . 9 (𝑣 ∈ ℝ → (∀𝑦 ∈ {𝑣}𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ) ↔ 𝑣 ≤ sup({𝑠, 𝑣}, ℝ, < )))
7539, 74syl 14 . . . . . . . 8 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → (∀𝑦 ∈ {𝑣}𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ) ↔ 𝑣 ≤ sup({𝑠, 𝑣}, ℝ, < )))
7672, 75mpbird 166 . . . . . . 7 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∀𝑦 ∈ {𝑣}𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ))
77 ralun 3304 . . . . . . 7 ((∀𝑦𝑢 𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ) ∧ ∀𝑦 ∈ {𝑣}𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )) → ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ))
7870, 76, 77syl2anc 409 . . . . . 6 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < ))
79 breq2 3986 . . . . . . . 8 (𝑥 = sup({𝑠, 𝑣}, ℝ, < ) → (𝑦𝑥𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )))
8079ralbidv 2466 . . . . . . 7 (𝑥 = sup({𝑠, 𝑣}, ℝ, < ) → (∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥 ↔ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )))
8180rspcev 2830 . . . . . 6 ((sup({𝑠, 𝑣}, ℝ, < ) ∈ ℝ ∧ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦 ≤ sup({𝑠, 𝑣}, ℝ, < )) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥)
8241, 78, 81syl2anc 409 . . . . 5 ((((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) ∧ (𝑠 ∈ ℝ ∧ ∀𝑦𝑢 𝑦𝑠)) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥)
8333, 82rexlimddv 2588 . . . 4 (((𝑢 ∈ Fin ∧ (𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥)) ∧ (𝑢 ∪ {𝑣}) ⊆ ℝ) → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥)
8483exp31 362 . . 3 (𝑢 ∈ Fin → ((𝑢 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝑢 𝑦𝑥) → ((𝑢 ∪ {𝑣}) ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦 ∈ (𝑢 ∪ {𝑣})𝑦𝑥)))
854, 8, 12, 16, 23, 84findcard2 6855 . 2 (𝐴 ∈ Fin → (𝐴 ⊆ ℝ → ∃𝑥 ∈ ℝ ∀𝑦𝐴 𝑦𝑥))
8685impcom 124 1 ((𝐴 ⊆ ℝ ∧ 𝐴 ∈ Fin) → ∃𝑥 ∈ ℝ ∀𝑦𝐴 𝑦𝑥)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  wb 104   = wceq 1343  wcel 2136  wral 2444  wrex 2445  cun 3114  wss 3116  c0 3409  {csn 3576  {cpr 3577   class class class wbr 3982  Fincfn 6706  supcsup 6947  cr 7752  0cc0 7753   < clt 7933  cle 7934
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-mulrcl 7852  ax-addcom 7853  ax-mulcom 7854  ax-addass 7855  ax-mulass 7856  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-1rid 7860  ax-0id 7861  ax-rnegex 7862  ax-precex 7863  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-apti 7868  ax-pre-ltadd 7869  ax-pre-mulgt0 7870  ax-pre-mulext 7871  ax-arch 7872  ax-caucvg 7873
This theorem depends on definitions:  df-bi 116  df-dc 825  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rmo 2452  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-if 3521  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-po 4274  df-iso 4275  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-frec 6359  df-er 6501  df-en 6707  df-fin 6709  df-sup 6949  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-reap 8473  df-ap 8480  df-div 8569  df-inn 8858  df-2 8916  df-3 8917  df-4 8918  df-n0 9115  df-z 9192  df-uz 9467  df-rp 9590  df-seqfrec 10381  df-exp 10455  df-cj 10784  df-re 10785  df-im 10786  df-rsqrt 10940  df-abs 10941
This theorem is referenced by:  fsum3cvg3  11337
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