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| Mirrors > Home > MPE Home > Th. List > pwdjuidm | Structured version Visualization version GIF version | ||
| Description: If the natural numbers inject into 𝐴, then 𝒫 𝐴 is idempotent under cardinal sum. (Contributed by Mario Carneiro, 15-May-2015.) |
| Ref | Expression |
|---|---|
| pwdjuidm | ⊢ (ω ≼ 𝐴 → (𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reldom 8993 | . . . 4 ⊢ Rel ≼ | |
| 2 | 1 | brrelex2i 5712 | . . 3 ⊢ (ω ≼ 𝐴 → 𝐴 ∈ V) |
| 3 | pwdju1 10282 | . . 3 ⊢ (𝐴 ∈ V → (𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 (𝐴 ⊔ 1o)) | |
| 4 | 2, 3 | syl 18 | . 2 ⊢ (ω ≼ 𝐴 → (𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 (𝐴 ⊔ 1o)) |
| 5 | infdju1 10281 | . . 3 ⊢ (ω ≼ 𝐴 → (𝐴 ⊔ 1o) ≈ 𝐴) | |
| 6 | pwen 9183 | . . 3 ⊢ ((𝐴 ⊔ 1o) ≈ 𝐴 → 𝒫 (𝐴 ⊔ 1o) ≈ 𝒫 𝐴) | |
| 7 | 5, 6 | syl 18 | . 2 ⊢ (ω ≼ 𝐴 → 𝒫 (𝐴 ⊔ 1o) ≈ 𝒫 𝐴) |
| 8 | entr 9047 | . 2 ⊢ (((𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 (𝐴 ⊔ 1o) ∧ 𝒫 (𝐴 ⊔ 1o) ≈ 𝒫 𝐴) → (𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 𝐴) | |
| 9 | 4, 7, 8 | syl2anc 596 | 1 ⊢ (ω ≼ 𝐴 → (𝒫 𝐴 ⊔ 𝒫 𝐴) ≈ 𝒫 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2146 Vcvv 3454 𝒫 cpw 4560 class class class wbr 5106 ωcom 7887 1oc1o 8483 ≈ cen 8984 ≼ cdom 8985 ⊔ cdju 9992 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7761 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-int 4911 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6501 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7888 df-1st 8011 df-2nd 8012 df-1o 8490 df-2o 8491 df-er 8731 df-map 8863 df-en 8988 df-dom 8989 df-dju 9995 |
| This theorem is used by: gchaclem 10776 |
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