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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 8989 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) | |
| 2 | 1 | adantr 486 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 𝐴 ≈ 𝐴) |
| 3 | ensn1g 9027 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ 1o) | |
| 4 | 3 | ensymd 9010 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 1o ≈ {𝐴}) |
| 5 | 4 | adantr 486 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → 1o ≈ {𝐴}) |
| 6 | disjsn 4671 | . . . 4 ⊢ ((𝐴 ∩ {𝐴}) = ∅ ↔ ¬ 𝐴 ∈ 𝐴) | |
| 7 | 6 | bilanri 512 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ∩ {𝐴}) = ∅) |
| 8 | djuenun 10220 | . . 3 ⊢ ((𝐴 ≈ 𝐴 ∧ 1o ≈ {𝐴} ∧ (𝐴 ∩ {𝐴}) = ∅) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) | |
| 9 | 2, 5, 7, 8 | syl3anc 1398 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ (𝐴 ∪ {𝐴})) |
| 10 | df-suc 6357 | . 2 ⊢ suc 𝐴 = (𝐴 ∪ {𝐴}) | |
| 11 | 9, 10 | breqtrrdi 5146 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ¬ 𝐴 ∈ 𝐴) → (𝐴 ⊔ 1o) ≈ suc 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∪ cun 3896 ∩ cin 3897 ∅c0 4278 {csn 4583 class class class wbr 5102 suc csuc 6353 1oc1o 8447 ≈ cen 8948 ⊔ cdju 9950 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7734 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-pss 3918 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-int 4907 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5542 df-eprel 5547 df-po 5555 df-so 5556 df-fr 5600 df-we 5602 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-ord 6354 df-on 6355 df-suc 6357 df-iota 6483 df-fun 6529 df-fn 6530 df-f 6531 df-f1 6532 df-fo 6533 df-f1o 6534 df-fv 6535 df-1st 7984 df-2nd 7985 df-1o 8454 df-er 8695 df-en 8952 df-dju 9953 |
| This theorem is used by: dju1p1e2ALT 10224 nnadju 10247 pwsdompw 10252 |
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