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Mirrors > Home > MPE Home > Th. List > cda1en | Structured version Visualization version GIF version |
Description: Cardinal addition with cardinal one (which is the same as ordinal one). Used in proof of Theorem 6J of [Enderton] p. 143. (Contributed by NM, 28-Sep-2004.) (Revised by Mario Carneiro, 29-Apr-2015.) |
Ref | Expression |
---|---|
cda1en | ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 +𝑐 1𝑜) ≈ suc 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | enrefg 7873 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) | |
2 | 1 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 𝐴 ≈ 𝐴) |
3 | ensn1g 7907 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ 1𝑜) | |
4 | 3 | ensymd 7893 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 1𝑜 ≈ {𝐴}) |
5 | 4 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 1𝑜 ≈ {𝐴}) |
6 | simpr 476 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → ¬ 𝐴 ∈ 𝐴) | |
7 | disjsn 4192 | . . . 4 ⊢ ((𝐴 ∩ {𝐴}) = ∅ ↔ ¬ 𝐴 ∈ 𝐴) | |
8 | 6, 7 | sylibr 223 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ∩ {𝐴}) = ∅) |
9 | cdaenun 8879 | . . 3 ⊢ ((𝐴 ≈ 𝐴 ∧ 1𝑜 ≈ {𝐴} ∧ (𝐴 ∩ {𝐴}) = ∅) → (𝐴 +𝑐 1𝑜) ≈ (𝐴 ∪ {𝐴})) | |
10 | 2, 5, 8, 9 | syl3anc 1318 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 +𝑐 1𝑜) ≈ (𝐴 ∪ {𝐴})) |
11 | df-suc 5646 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
12 | 10, 11 | syl6breqr 4625 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 +𝑐 1𝑜) ≈ suc 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ∪ cun 3538 ∩ cin 3539 ∅c0 3874 {csn 4125 class class class wbr 4583 suc csuc 5642 (class class class)co 6549 1𝑜c1o 7440 ≈ cen 7838 +𝑐 ccda 8872 |
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-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-rab 2905 df-v 3175 df-sbc 3403 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-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-ord 5643 df-on 5644 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-1o 7447 df-er 7629 df-en 7842 df-cda 8873 |
This theorem is referenced by: pm110.643ALT 8883 pwsdompw 8909 |
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