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| Mirrors > Home > MPE Home > Th. List > dju1en | 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 |
|---|---|
| dju1en | ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ suc 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | enrefg 8967 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) | |
| 2 | 1 | adantr 484 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 𝐴 ≈ 𝐴) |
| 3 | ensn1g 9005 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ 1o) | |
| 4 | 3 | ensymd 8988 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 1o ≈ {𝐴}) |
| 5 | 4 | adantr 484 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 1o ≈ {𝐴}) |
| 6 | disjsn 4672 | . . . 4 ⊢ ((𝐴 ∩ {𝐴}) = ∅ ↔ ¬ 𝐴 ∈ 𝐴) | |
| 7 | 6 | bilanri 510 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ∩ {𝐴}) = ∅) |
| 8 | djuenun 10129 | . . 3 ⊢ ((𝐴 ≈ 𝐴 ∧ 1o ≈ {𝐴} ∧ (𝐴 ∩ {𝐴}) = ∅) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) | |
| 9 | 2, 5, 7, 8 | syl3anc 1392 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) |
| 10 | df-suc 6354 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 11 | 9, 10 | breqtrrdi 5144 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ suc 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 = wceq 1562 ∈ wcel 2144 ∪ cun 3904 ∩ cin 3905 ∅c0 4287 {csn 4584 class class class wbr 5102 suc csuc 6350 1oc1o 8432 ≈ cen 8926 ⊔ cdju 9858 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1100 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3079 df-rex 3089 df-rab 3417 df-v 3458 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-pss 3926 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-int 4908 df-br 5103 df-opab 5165 df-mpt 5184 df-tr 5210 df-id 5544 df-eprel 5549 df-po 5557 df-so 5558 df-fr 5602 df-we 5604 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-ord 6351 df-on 6352 df-suc 6354 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-1st 7972 df-2nd 7973 df-1o 8439 df-er 8680 df-en 8930 df-dju 9861 |
| This theorem is referenced by: dju1p1e2ALT 10133 nnadju 10156 pwsdompw 10161 |
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