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Theorem renegeulemv 39204
Description: Lemma for renegeu 39206 and similar. Derive existential uniqueness from existence. (Contributed by Steven Nguyen, 28-Jan-2023.)
Hypotheses
Ref Expression
renegeulemv.b (𝜑𝐵 ∈ ℝ)
renegeulemv.1 (𝜑 → ∃𝑦 ∈ ℝ (𝐵 + 𝑦) = 𝐴)
Assertion
Ref Expression
renegeulemv (𝜑 → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴)
Distinct variable groups:   𝑥,𝑦,𝐴   𝑥,𝐵,𝑦   𝜑,𝑥,𝑦

Proof of Theorem renegeulemv
StepHypRef Expression
1 renegeulemv.1 . 2 (𝜑 → ∃𝑦 ∈ ℝ (𝐵 + 𝑦) = 𝐴)
2 simprl 769 . . 3 ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → 𝑦 ∈ ℝ)
3 simplrr 776 . . . . . . 7 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → (𝐵 + 𝑦) = 𝐴)
43eqcomd 2830 . . . . . 6 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝐴 = (𝐵 + 𝑦))
54eqeq2d 2835 . . . . 5 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = 𝐴 ↔ (𝐵 + 𝑥) = (𝐵 + 𝑦)))
6 simpr 487 . . . . . 6 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝑥 ∈ ℝ)
7 simplrl 775 . . . . . 6 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝑦 ∈ ℝ)
8 renegeulemv.b . . . . . . 7 (𝜑𝐵 ∈ ℝ)
98ad2antrr 724 . . . . . 6 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → 𝐵 ∈ ℝ)
10 readdcan 10817 . . . . . 6 ((𝑥 ∈ ℝ ∧ 𝑦 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝐵 + 𝑥) = (𝐵 + 𝑦) ↔ 𝑥 = 𝑦))
116, 7, 9, 10syl3anc 1367 . . . . 5 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = (𝐵 + 𝑦) ↔ 𝑥 = 𝑦))
125, 11bitrd 281 . . . 4 (((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) ∧ 𝑥 ∈ ℝ) → ((𝐵 + 𝑥) = 𝐴𝑥 = 𝑦))
1312ralrimiva 3185 . . 3 ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → ∀𝑥 ∈ ℝ ((𝐵 + 𝑥) = 𝐴𝑥 = 𝑦))
14 reu6i 3722 . . 3 ((𝑦 ∈ ℝ ∧ ∀𝑥 ∈ ℝ ((𝐵 + 𝑥) = 𝐴𝑥 = 𝑦)) → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴)
152, 13, 14syl2anc 586 . 2 ((𝜑 ∧ (𝑦 ∈ ℝ ∧ (𝐵 + 𝑦) = 𝐴)) → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴)
161, 15rexlimddv 3294 1 (𝜑 → ∃!𝑥 ∈ ℝ (𝐵 + 𝑥) = 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 398   = wceq 1536  wcel 2113  wral 3141  wrex 3142  ∃!wreu 3143  (class class class)co 7159  cr 10539   + caddc 10543
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796  ax-sep 5206  ax-nul 5213  ax-pow 5269  ax-pr 5333  ax-un 7464  ax-resscn 10597  ax-addrcl 10601  ax-pre-lttri 10614  ax-pre-lttrn 10615  ax-pre-ltadd 10616
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ne 3020  df-nel 3127  df-ral 3146  df-rex 3147  df-reu 3148  df-rab 3150  df-v 3499  df-sbc 3776  df-csb 3887  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4471  df-pw 4544  df-sn 4571  df-pr 4573  df-op 4577  df-uni 4842  df-br 5070  df-opab 5132  df-mpt 5150  df-id 5463  df-po 5477  df-so 5478  df-xp 5564  df-rel 5565  df-cnv 5566  df-co 5567  df-dm 5568  df-rn 5569  df-res 5570  df-ima 5571  df-iota 6317  df-fun 6360  df-fn 6361  df-f 6362  df-f1 6363  df-fo 6364  df-f1o 6365  df-fv 6366  df-ov 7162  df-er 8292  df-en 8513  df-dom 8514  df-sdom 8515  df-pnf 10680  df-mnf 10681  df-ltxr 10683
This theorem is referenced by:  renegeulem  39205
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