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Theorem oaf1o 7530
 Description: Left addition by a constant is a bijection from ordinals to ordinals greater than the constant. (Contributed by Mario Carneiro, 30-May-2015.)
Assertion
Ref Expression
oaf1o (𝐴 ∈ On → (𝑥 ∈ On ↦ (𝐴 +𝑜 𝑥)):On–1-1-onto→(On ∖ 𝐴))
Distinct variable group:   𝑥,𝐴

Proof of Theorem oaf1o
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 oacl 7502 . . . 4 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → (𝐴 +𝑜 𝑥) ∈ On)
2 oaword1 7519 . . . . 5 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → 𝐴 ⊆ (𝐴 +𝑜 𝑥))
3 ontri1 5674 . . . . . 6 ((𝐴 ∈ On ∧ (𝐴 +𝑜 𝑥) ∈ On) → (𝐴 ⊆ (𝐴 +𝑜 𝑥) ↔ ¬ (𝐴 +𝑜 𝑥) ∈ 𝐴))
41, 3syldan 486 . . . . 5 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → (𝐴 ⊆ (𝐴 +𝑜 𝑥) ↔ ¬ (𝐴 +𝑜 𝑥) ∈ 𝐴))
52, 4mpbid 221 . . . 4 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → ¬ (𝐴 +𝑜 𝑥) ∈ 𝐴)
61, 5eldifd 3551 . . 3 ((𝐴 ∈ On ∧ 𝑥 ∈ On) → (𝐴 +𝑜 𝑥) ∈ (On ∖ 𝐴))
76ralrimiva 2949 . 2 (𝐴 ∈ On → ∀𝑥 ∈ On (𝐴 +𝑜 𝑥) ∈ (On ∖ 𝐴))
8 simpl 472 . . . . 5 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → 𝐴 ∈ On)
9 eldifi 3694 . . . . . 6 (𝑦 ∈ (On ∖ 𝐴) → 𝑦 ∈ On)
109adantl 481 . . . . 5 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → 𝑦 ∈ On)
11 eldifn 3695 . . . . . . 7 (𝑦 ∈ (On ∖ 𝐴) → ¬ 𝑦𝐴)
1211adantl 481 . . . . . 6 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → ¬ 𝑦𝐴)
13 ontri1 5674 . . . . . . 7 ((𝐴 ∈ On ∧ 𝑦 ∈ On) → (𝐴𝑦 ↔ ¬ 𝑦𝐴))
1410, 13syldan 486 . . . . . 6 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → (𝐴𝑦 ↔ ¬ 𝑦𝐴))
1512, 14mpbird 246 . . . . 5 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → 𝐴𝑦)
16 oawordeu 7522 . . . . 5 (((𝐴 ∈ On ∧ 𝑦 ∈ On) ∧ 𝐴𝑦) → ∃!𝑥 ∈ On (𝐴 +𝑜 𝑥) = 𝑦)
178, 10, 15, 16syl21anc 1317 . . . 4 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → ∃!𝑥 ∈ On (𝐴 +𝑜 𝑥) = 𝑦)
18 eqcom 2617 . . . . 5 ((𝐴 +𝑜 𝑥) = 𝑦𝑦 = (𝐴 +𝑜 𝑥))
1918reubii 3105 . . . 4 (∃!𝑥 ∈ On (𝐴 +𝑜 𝑥) = 𝑦 ↔ ∃!𝑥 ∈ On 𝑦 = (𝐴 +𝑜 𝑥))
2017, 19sylib 207 . . 3 ((𝐴 ∈ On ∧ 𝑦 ∈ (On ∖ 𝐴)) → ∃!𝑥 ∈ On 𝑦 = (𝐴 +𝑜 𝑥))
2120ralrimiva 2949 . 2 (𝐴 ∈ On → ∀𝑦 ∈ (On ∖ 𝐴)∃!𝑥 ∈ On 𝑦 = (𝐴 +𝑜 𝑥))
22 eqid 2610 . . 3 (𝑥 ∈ On ↦ (𝐴 +𝑜 𝑥)) = (𝑥 ∈ On ↦ (𝐴 +𝑜 𝑥))
2322f1ompt 6290 . 2 ((𝑥 ∈ On ↦ (𝐴 +𝑜 𝑥)):On–1-1-onto→(On ∖ 𝐴) ↔ (∀𝑥 ∈ On (𝐴 +𝑜 𝑥) ∈ (On ∖ 𝐴) ∧ ∀𝑦 ∈ (On ∖ 𝐴)∃!𝑥 ∈ On 𝑦 = (𝐴 +𝑜 𝑥)))
247, 21, 23sylanbrc 695 1 (𝐴 ∈ On → (𝑥 ∈ On ↦ (𝐴 +𝑜 𝑥)):On–1-1-onto→(On ∖ 𝐴))
 Colors of variables: wff setvar class Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∀wral 2896  ∃!wreu 2898   ∖ cdif 3537   ⊆ wss 3540   ↦ cmpt 4643  Oncon0 5640  –1-1-onto→wf1o 5803  (class class class)co 6549   +𝑜 coa 7444 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847 This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-reu 2903  df-rmo 2904  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-oadd 7451 This theorem is referenced by:  oacomf1olem  7531
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