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Mirrors > Home > MPE Home > Th. List > dju0en | Structured version Visualization version GIF version |
Description: Cardinal addition with cardinal zero (the empty set). Part (a1) of proof of Theorem 6J of [Enderton] p. 143. (Contributed by NM, 27-Sep-2004.) (Revised by Mario Carneiro, 29-Apr-2015.) |
Ref | Expression |
---|---|
dju0en | ⊢ (𝐴 ∈ 𝑉 → (𝐴 ⊔ ∅) ≈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ex 5268 | . . 3 ⊢ ∅ ∈ V | |
2 | in0 4355 | . . 3 ⊢ (𝐴 ∩ ∅) = ∅ | |
3 | endjudisj 10112 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∅ ∈ V ∧ (𝐴 ∩ ∅) = ∅) → (𝐴 ⊔ ∅) ≈ (𝐴 ∪ ∅)) | |
4 | 1, 2, 3 | mp3an23 1454 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ⊔ ∅) ≈ (𝐴 ∪ ∅)) |
5 | un0 4354 | . 2 ⊢ (𝐴 ∪ ∅) = 𝐴 | |
6 | 4, 5 | breqtrdi 5150 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ⊔ ∅) ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1542 ∈ wcel 2107 Vcvv 3447 ∪ cun 3912 ∩ cin 3913 ∅c0 4286 class class class wbr 5109 ≈ cen 8886 ⊔ cdju 9842 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5260 ax-nul 5267 ax-pow 5324 ax-pr 5388 ax-un 7676 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3407 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3933 df-nul 4287 df-if 4491 df-pw 4566 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4870 df-int 4912 df-br 5110 df-opab 5172 df-mpt 5193 df-tr 5227 df-id 5535 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5592 df-we 5594 df-xp 5643 df-rel 5644 df-cnv 5645 df-co 5646 df-dm 5647 df-rn 5648 df-res 5649 df-ima 5650 df-ord 6324 df-on 6325 df-suc 6327 df-iota 6452 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-1st 7925 df-2nd 7926 df-1o 8416 df-er 8654 df-en 8890 df-dju 9845 |
This theorem is referenced by: djulepw 10136 nnadju 10141 |
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