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Mirrors > Home > MPE Home > Th. List > Mathboxes > renegeulemv | Structured version Visualization version GIF version |
Description: Lemma for renegeu 40274 and similar. Derive existential uniqueness from existence. (Contributed by Steven Nguyen, 28-Jan-2023.) |
Ref | Expression |
---|---|
renegeulemv.b | ⊢ (𝜑 → 𝐵 ∈ ℝ) |
renegeulemv.1 | ⊢ (𝜑 → ∃𝑦 ∈ ℝ (𝐵 + 𝑦) = 𝐴) |
Ref | Expression |
---|---|
renegeulemv | ⊢ (𝜑 → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | renegeulemv.1 | . 2 ⊢ (𝜑 → ∃𝑦 ∈ ℝ (𝐵 + 𝑦) = 𝐴) | |
2 | simprl 767 | . . 3 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → 𝑦 ∈ ℝ) | |
3 | simplrr 774 | . . . . . . 7 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → (𝐵 + 𝑦) = 𝐴) | |
4 | 3 | eqcomd 2744 | . . . . . 6 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝐴 = (𝐵 + 𝑦)) |
5 | 4 | eqeq2d 2749 | . . . . 5 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = 𝐴 ↔ (𝐵 + 𝑥) = (𝐵 + 𝑦))) |
6 | simpr 484 | . . . . . 6 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝑥 ∈ ℝ) | |
7 | simplrl 773 | . . . . . 6 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝑦 ∈ ℝ) | |
8 | renegeulemv.b | . . . . . . 7 ⊢ (𝜑 → 𝐵 ∈ ℝ) | |
9 | 8 | ad2antrr 722 | . . . . . 6 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝐵 ∈ ℝ) |
10 | readdcan 11079 | . . . . . 6 ⊢ ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝐵 + 𝑥) = (𝐵 + 𝑦) ↔ 𝑥 = 𝑦)) | |
11 | 6, 7, 9, 10 | syl3anc 1369 | . . . . 5 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = (𝐵 + 𝑦) ↔ 𝑥 = 𝑦)) |
12 | 5, 11 | bitrd 278 | . . . 4 ⊢ (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = 𝐴 ↔ 𝑥 = 𝑦)) |
13 | 12 | ralrimiva 3107 | . . 3 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → ∀𝑥 ∈ ℝ ((𝐵 + 𝑥) = 𝐴 ↔ 𝑥 = 𝑦)) |
14 | reu6i 3658 | . . 3 ⊢ ((𝑦 ∈ ℝ ∧ ∀𝑥 ∈ ℝ ((𝐵 + 𝑥) = 𝐴 ↔ 𝑥 = 𝑦)) → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴) | |
15 | 2, 13, 14 | syl2anc 583 | . 2 ⊢ ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴) |
16 | 1, 15 | rexlimddv 3219 | 1 ⊢ (𝜑 → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ∀wral 3063 ∃wrex 3064 ∃!wreu 3065 (class class class)co 7255 ℝcr 10801 + caddc 10805 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-resscn 10859 ax-addrcl 10863 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-po 5494 df-so 5495 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-ov 7258 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-ltxr 10945 |
This theorem is referenced by: renegeulem 40273 |
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