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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 8919 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) | |
| 2 | 1 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 𝐴 ≈ 𝐴) |
| 3 | ensn1g 8957 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ 1o) | |
| 4 | 3 | ensymd 8940 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 1o ≈ {𝐴}) |
| 5 | 4 | adantr 480 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 1o ≈ {𝐴}) |
| 6 | simpr 484 | . . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → ¬ 𝐴 ∈ 𝐴) | |
| 7 | disjsn 4666 | . . . 4 ⊢ ((𝐴 ∩ {𝐴}) = ∅ ↔ ¬ 𝐴 ∈ 𝐴) | |
| 8 | 6, 7 | sylibr 234 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ∩ {𝐴}) = ∅) |
| 9 | djuenun 10079 | . . 3 ⊢ ((𝐴 ≈ 𝐴 ∧ 1o ≈ {𝐴} ∧ (𝐴 ∩ {𝐴}) = ∅) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) | |
| 10 | 2, 5, 8, 9 | syl3anc 1373 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) |
| 11 | df-suc 6321 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 12 | 10, 11 | breqtrrdi 5138 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ suc 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1541 ∈ wcel 2113 ∪ cun 3897 ∩ cin 3898 ∅c0 4283 {csn 4578 class class class wbr 5096 suc csuc 6317 1oc1o 8388 ≈ cen 8878 ⊔ cdju 9808 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-int 4901 df-br 5097 df-opab 5159 df-mpt 5178 df-tr 5204 df-id 5517 df-eprel 5522 df-po 5530 df-so 5531 df-fr 5575 df-we 5577 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-ord 6318 df-on 6319 df-suc 6321 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-1st 7931 df-2nd 7932 df-1o 8395 df-er 8633 df-en 8882 df-dju 9811 |
| This theorem is referenced by: dju1p1e2ALT 10083 nnadju 10106 pwsdompw 10111 |
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