This is an inofficial mirror of http://metamath.tirix.org for personal testing of a visualizer extension only.
Description: If a real number can be approximated from below by members of a set, then it is less than or equal to the supremum of the set. (Contributed by Glauco Siliprandi, 17-Aug-2020)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | supxrgere.xph | ⊢ Ⅎ 𝑥 𝜑 | |
| supxrgere.a | ⊢ ( 𝜑 → 𝐴 ⊆ ℝ* ) | ||
| supxrgere.b | ⊢ ( 𝜑 → 𝐵 ∈ ℝ ) | ||
| supxrgere.y | ⊢ ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ) | ||
| Assertion | supxrgere | ⊢ ( 𝜑 → 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | supxrgere.xph | ⊢ Ⅎ 𝑥 𝜑 | |
| 2 | supxrgere.a | ⊢ ( 𝜑 → 𝐴 ⊆ ℝ* ) | |
| 3 | supxrgere.b | ⊢ ( 𝜑 → 𝐵 ∈ ℝ ) | |
| 4 | supxrgere.y | ⊢ ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ) | |
| 5 | rexr | ⊢ ( 𝐵 ∈ ℝ → 𝐵 ∈ ℝ* ) | |
| 6 | pnfxr | ⊢ +∞ ∈ ℝ* | |
| 7 | 6 | a1i | ⊢ ( 𝐵 ∈ ℝ → +∞ ∈ ℝ* ) |
| 8 | ltpnf | ⊢ ( 𝐵 ∈ ℝ → 𝐵 < +∞ ) | |
| 9 | 5 7 8 | xrltled | ⊢ ( 𝐵 ∈ ℝ → 𝐵 ≤ +∞ ) |
| 10 | 3 9 | syl | ⊢ ( 𝜑 → 𝐵 ≤ +∞ ) |
| 11 | 10 | adantr | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) = +∞ ) → 𝐵 ≤ +∞ ) |
| 12 | id | ⊢ ( sup ( 𝐴 , ℝ* , < ) = +∞ → sup ( 𝐴 , ℝ* , < ) = +∞ ) | |
| 13 | 12 | eqcomd | ⊢ ( sup ( 𝐴 , ℝ* , < ) = +∞ → +∞ = sup ( 𝐴 , ℝ* , < ) ) |
| 14 | 13 | adantl | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) = +∞ ) → +∞ = sup ( 𝐴 , ℝ* , < ) ) |
| 15 | 11 14 | breqtrd | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) = +∞ ) → 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| 16 | simpl | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → 𝜑 ) | |
| 17 | 1rp | ⊢ 1 ∈ ℝ+ | |
| 18 | nfcv | ⊢ Ⅎ 𝑥 1 | |
| 19 | nfv | ⊢ Ⅎ 𝑥 1 ∈ ℝ+ | |
| 20 | 1 19 | nfan | ⊢ Ⅎ 𝑥 ( 𝜑 ∧ 1 ∈ ℝ+ ) |
| 21 | nfv | ⊢ Ⅎ 𝑥 ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 | |
| 22 | 20 21 | nfim | ⊢ Ⅎ 𝑥 ( ( 𝜑 ∧ 1 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) |
| 23 | eleq1 | ⊢ ( 𝑥 = 1 → ( 𝑥 ∈ ℝ+ ↔ 1 ∈ ℝ+ ) ) | |
| 24 | 23 | anbi2d | ⊢ ( 𝑥 = 1 → ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) ↔ ( 𝜑 ∧ 1 ∈ ℝ+ ) ) ) |
| 25 | oveq2 | ⊢ ( 𝑥 = 1 → ( 𝐵 − 𝑥 ) = ( 𝐵 − 1 ) ) | |
| 26 | 25 | breq1d | ⊢ ( 𝑥 = 1 → ( ( 𝐵 − 𝑥 ) < 𝑦 ↔ ( 𝐵 − 1 ) < 𝑦 ) ) |
| 27 | 26 | rexbidv | ⊢ ( 𝑥 = 1 → ( ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ↔ ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) ) |
| 28 | 24 27 | imbi12d | ⊢ ( 𝑥 = 1 → ( ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ) ↔ ( ( 𝜑 ∧ 1 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) ) ) |
| 29 | 18 22 28 4 | vtoclgf | ⊢ ( 1 ∈ ℝ+ → ( ( 𝜑 ∧ 1 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) ) |
| 30 | 17 29 | ax-mp | ⊢ ( ( 𝜑 ∧ 1 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) |
| 31 | 17 30 | mpan2 | ⊢ ( 𝜑 → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) |
| 32 | 31 | adantr | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 ) |
| 33 | mnfxr | ⊢ -∞ ∈ ℝ* | |
| 34 | 33 | a1i | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → -∞ ∈ ℝ* ) |
| 35 | 2 | sselda | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → 𝑦 ∈ ℝ* ) |
| 36 | 35 | 3adant3 | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → 𝑦 ∈ ℝ* ) |
| 37 | supxrcl | ⊢ ( 𝐴 ⊆ ℝ* → sup ( 𝐴 , ℝ* , < ) ∈ ℝ* ) | |
| 38 | 2 37 | syl | ⊢ ( 𝜑 → sup ( 𝐴 , ℝ* , < ) ∈ ℝ* ) |
| 39 | 38 | 3ad2ant1 | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ* ) |
| 40 | peano2rem | ⊢ ( 𝐵 ∈ ℝ → ( 𝐵 − 1 ) ∈ ℝ ) | |
| 41 | 3 40 | syl | ⊢ ( 𝜑 → ( 𝐵 − 1 ) ∈ ℝ ) |
| 42 | 41 | rexrd | ⊢ ( 𝜑 → ( 𝐵 − 1 ) ∈ ℝ* ) |
| 43 | 42 | adantr | ⊢ ( ( 𝜑 ∧ ¬ -∞ < 𝑦 ) → ( 𝐵 − 1 ) ∈ ℝ* ) |
| 44 | 43 | 3ad2antl1 | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → ( 𝐵 − 1 ) ∈ ℝ* ) |
| 45 | 36 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → 𝑦 ∈ ℝ* ) |
| 46 | 33 | a1i | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → -∞ ∈ ℝ* ) |
| 47 | simpl3 | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → ( 𝐵 − 1 ) < 𝑦 ) | |
| 48 | simpr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) ∧ ¬ -∞ < 𝑦 ) → ¬ -∞ < 𝑦 ) | |
| 49 | 35 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) ∧ ¬ -∞ < 𝑦 ) → 𝑦 ∈ ℝ* ) |
| 50 | 33 | a1i | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) ∧ ¬ -∞ < 𝑦 ) → -∞ ∈ ℝ* ) |
| 51 | xrlenlt | ⊢ ( ( 𝑦 ∈ ℝ* ∧ -∞ ∈ ℝ* ) → ( 𝑦 ≤ -∞ ↔ ¬ -∞ < 𝑦 ) ) | |
| 52 | 49 50 51 | syl2anc | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) ∧ ¬ -∞ < 𝑦 ) → ( 𝑦 ≤ -∞ ↔ ¬ -∞ < 𝑦 ) ) |
| 53 | 48 52 | mpbird | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) ∧ ¬ -∞ < 𝑦 ) → 𝑦 ≤ -∞ ) |
| 54 | 53 | 3adantl3 | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → 𝑦 ≤ -∞ ) |
| 55 | 44 45 46 47 54 | xrltletrd | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → ( 𝐵 − 1 ) < -∞ ) |
| 56 | nltmnf | ⊢ ( ( 𝐵 − 1 ) ∈ ℝ* → ¬ ( 𝐵 − 1 ) < -∞ ) | |
| 57 | 42 56 | syl | ⊢ ( 𝜑 → ¬ ( 𝐵 − 1 ) < -∞ ) |
| 58 | 57 | adantr | ⊢ ( ( 𝜑 ∧ ¬ -∞ < 𝑦 ) → ¬ ( 𝐵 − 1 ) < -∞ ) |
| 59 | 58 | 3ad2antl1 | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) ∧ ¬ -∞ < 𝑦 ) → ¬ ( 𝐵 − 1 ) < -∞ ) |
| 60 | 55 59 | condan | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → -∞ < 𝑦 ) |
| 61 | 2 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → 𝐴 ⊆ ℝ* ) |
| 62 | simpr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → 𝑦 ∈ 𝐴 ) | |
| 63 | supxrub | ⊢ ( ( 𝐴 ⊆ ℝ* ∧ 𝑦 ∈ 𝐴 ) → 𝑦 ≤ sup ( 𝐴 , ℝ* , < ) ) | |
| 64 | 61 62 63 | syl2anc | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → 𝑦 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| 65 | 64 | 3adant3 | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → 𝑦 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| 66 | 34 36 39 60 65 | xrltletrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ∧ ( 𝐵 − 1 ) < 𝑦 ) → -∞ < sup ( 𝐴 , ℝ* , < ) ) |
| 67 | 66 | 3exp | ⊢ ( 𝜑 → ( 𝑦 ∈ 𝐴 → ( ( 𝐵 − 1 ) < 𝑦 → -∞ < sup ( 𝐴 , ℝ* , < ) ) ) ) |
| 68 | 67 | adantr | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ( 𝑦 ∈ 𝐴 → ( ( 𝐵 − 1 ) < 𝑦 → -∞ < sup ( 𝐴 , ℝ* , < ) ) ) ) |
| 69 | 68 | rexlimdv | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ( ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 1 ) < 𝑦 → -∞ < sup ( 𝐴 , ℝ* , < ) ) ) |
| 70 | 32 69 | mpd | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → -∞ < sup ( 𝐴 , ℝ* , < ) ) |
| 71 | simpr | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) | |
| 72 | nltpnft | ⊢ ( sup ( 𝐴 , ℝ* , < ) ∈ ℝ* → ( sup ( 𝐴 , ℝ* , < ) = +∞ ↔ ¬ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) | |
| 73 | 38 72 | syl | ⊢ ( 𝜑 → ( sup ( 𝐴 , ℝ* , < ) = +∞ ↔ ¬ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) |
| 74 | 73 | adantr | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ( sup ( 𝐴 , ℝ* , < ) = +∞ ↔ ¬ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) |
| 75 | 71 74 | mtbid | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ¬ ¬ sup ( 𝐴 , ℝ* , < ) < +∞ ) |
| 76 | 75 | notnotrd | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → sup ( 𝐴 , ℝ* , < ) < +∞ ) |
| 77 | 70 76 | jca | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ( -∞ < sup ( 𝐴 , ℝ* , < ) ∧ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) |
| 78 | 38 | adantr | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ* ) |
| 79 | xrrebnd | ⊢ ( sup ( 𝐴 , ℝ* , < ) ∈ ℝ* → ( sup ( 𝐴 , ℝ* , < ) ∈ ℝ ↔ ( -∞ < sup ( 𝐴 , ℝ* , < ) ∧ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) ) | |
| 80 | 78 79 | syl | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → ( sup ( 𝐴 , ℝ* , < ) ∈ ℝ ↔ ( -∞ < sup ( 𝐴 , ℝ* , < ) ∧ sup ( 𝐴 , ℝ* , < ) < +∞ ) ) ) |
| 81 | 77 80 | mpbird | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) |
| 82 | simpl | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ) | |
| 83 | simpr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) | |
| 84 | 82 | simprd | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) |
| 85 | 3 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → 𝐵 ∈ ℝ ) |
| 86 | 84 85 | ltnled | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → ( sup ( 𝐴 , ℝ* , < ) < 𝐵 ↔ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) ) |
| 87 | 83 86 | mpbird | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → sup ( 𝐴 , ℝ* , < ) < 𝐵 ) |
| 88 | simpll | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → 𝜑 ) | |
| 89 | 3 | adantr | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) → 𝐵 ∈ ℝ ) |
| 90 | simpr | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) | |
| 91 | 89 90 | resubcld | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) → ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ ) |
| 92 | 91 | adantr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ ) |
| 93 | simpr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → sup ( 𝐴 , ℝ* , < ) < 𝐵 ) | |
| 94 | 90 | adantr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) |
| 95 | 88 3 | syl | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → 𝐵 ∈ ℝ ) |
| 96 | 94 95 | posdifd | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ( sup ( 𝐴 , ℝ* , < ) < 𝐵 ↔ 0 < ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) ) |
| 97 | 93 96 | mpbid | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → 0 < ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) |
| 98 | 92 97 | elrpd | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) |
| 99 | ovex | ⊢ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ V | |
| 100 | nfcv | ⊢ Ⅎ 𝑥 ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) | |
| 101 | nfv | ⊢ Ⅎ 𝑥 ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ | |
| 102 | 1 101 | nfan | ⊢ Ⅎ 𝑥 ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) |
| 103 | nfv | ⊢ Ⅎ 𝑥 ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 | |
| 104 | 102 103 | nfim | ⊢ Ⅎ 𝑥 ( ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) |
| 105 | eleq1 | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( 𝑥 ∈ ℝ+ ↔ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) ) | |
| 106 | 105 | anbi2d | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) ↔ ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) ) ) |
| 107 | oveq2 | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( 𝐵 − 𝑥 ) = ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) ) | |
| 108 | 107 | breq1d | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( ( 𝐵 − 𝑥 ) < 𝑦 ↔ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) ) |
| 109 | 108 | rexbidv | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ↔ ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) ) |
| 110 | 106 109 | imbi12d | ⊢ ( 𝑥 = ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) → ( ( ( 𝜑 ∧ 𝑥 ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − 𝑥 ) < 𝑦 ) ↔ ( ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) ) ) |
| 111 | 100 104 110 4 | vtoclgf | ⊢ ( ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ V → ( ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) ) |
| 112 | 99 111 | ax-mp | ⊢ ( ( 𝜑 ∧ ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ∈ ℝ+ ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) |
| 113 | 88 98 112 | syl2anc | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) |
| 114 | 3 | recnd | ⊢ ( 𝜑 → 𝐵 ∈ ℂ ) |
| 115 | 114 | ad3antrrr | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → 𝐵 ∈ ℂ ) |
| 116 | 90 | recnd | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) → sup ( 𝐴 , ℝ* , < ) ∈ ℂ ) |
| 117 | 116 | ad2antrr | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → sup ( 𝐴 , ℝ* , < ) ∈ ℂ ) |
| 118 | 115 117 | nncand | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) = sup ( 𝐴 , ℝ* , < ) ) |
| 119 | 118 | eqcomd | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → sup ( 𝐴 , ℝ* , < ) = ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) ) |
| 120 | simpr | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) | |
| 121 | 119 120 | eqbrtrd | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 ) → sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 122 | 121 | ex | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ( ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 → sup ( 𝐴 , ℝ* , < ) < 𝑦 ) ) |
| 123 | 122 | adantr | ⊢ ( ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) ∧ 𝑦 ∈ 𝐴 ) → ( ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 → sup ( 𝐴 , ℝ* , < ) < 𝑦 ) ) |
| 124 | 123 | reximdva | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ( ∃ 𝑦 ∈ 𝐴 ( 𝐵 − ( 𝐵 − sup ( 𝐴 , ℝ* , < ) ) ) < 𝑦 → ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) ) |
| 125 | 113 124 | mpd | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ sup ( 𝐴 , ℝ* , < ) < 𝐵 ) → ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 126 | 82 87 125 | syl2anc | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 127 | 61 37 | syl | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → sup ( 𝐴 , ℝ* , < ) ∈ ℝ* ) |
| 128 | 35 127 | xrlenltd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → ( 𝑦 ≤ sup ( 𝐴 , ℝ* , < ) ↔ ¬ sup ( 𝐴 , ℝ* , < ) < 𝑦 ) ) |
| 129 | 64 128 | mpbid | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ 𝐴 ) → ¬ sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 130 | 129 | ralrimiva | ⊢ ( 𝜑 → ∀ 𝑦 ∈ 𝐴 ¬ sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 131 | ralnex | ⊢ ( ∀ 𝑦 ∈ 𝐴 ¬ sup ( 𝐴 , ℝ* , < ) < 𝑦 ↔ ¬ ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) | |
| 132 | 130 131 | sylib | ⊢ ( 𝜑 → ¬ ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 133 | 132 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) ∧ ¬ 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) → ¬ ∃ 𝑦 ∈ 𝐴 sup ( 𝐴 , ℝ* , < ) < 𝑦 ) |
| 134 | 126 133 | condan | ⊢ ( ( 𝜑 ∧ sup ( 𝐴 , ℝ* , < ) ∈ ℝ ) → 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| 135 | 16 81 134 | syl2anc | ⊢ ( ( 𝜑 ∧ ¬ sup ( 𝐴 , ℝ* , < ) = +∞ ) → 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) |
| 136 | 15 135 | pm2.61dan | ⊢ ( 𝜑 → 𝐵 ≤ sup ( 𝐴 , ℝ* , < ) ) |