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Mirrors > Home > MPE Home > Th. List > Mathboxes > hfuni | Structured version Visualization version GIF version |
Description: The union of an HF set is itself hereditarily finite. (Contributed by Scott Fenton, 16-Jul-2015.) |
Ref | Expression |
---|---|
hfuni | ⊢ (𝐴 ∈ Hf → ∪ 𝐴 ∈ Hf ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rankuni 8609 | . . 3 ⊢ (rank‘∪ 𝐴) = ∪ (rank‘𝐴) | |
2 | rankon 8541 | . . . . . 6 ⊢ (rank‘𝐴) ∈ On | |
3 | 2 | ontrci 5750 | . . . . 5 ⊢ Tr (rank‘𝐴) |
4 | df-tr 4681 | . . . . 5 ⊢ (Tr (rank‘𝐴) ↔ ∪ (rank‘𝐴) ⊆ (rank‘𝐴)) | |
5 | 3, 4 | mpbi 219 | . . . 4 ⊢ ∪ (rank‘𝐴) ⊆ (rank‘𝐴) |
6 | elhf2g 31453 | . . . . 5 ⊢ (𝐴 ∈ Hf → (𝐴 ∈ Hf ↔ (rank‘𝐴) ∈ ω)) | |
7 | 6 | ibi 255 | . . . 4 ⊢ (𝐴 ∈ Hf → (rank‘𝐴) ∈ ω) |
8 | rankon 8541 | . . . . . . 7 ⊢ (rank‘∪ 𝐴) ∈ On | |
9 | 1, 8 | eqeltrri 2685 | . . . . . 6 ⊢ ∪ (rank‘𝐴) ∈ On |
10 | 9 | onordi 5749 | . . . . 5 ⊢ Ord ∪ (rank‘𝐴) |
11 | ordom 6966 | . . . . 5 ⊢ Ord ω | |
12 | ordtr2 5685 | . . . . 5 ⊢ ((Ord ∪ (rank‘𝐴) ∧ Ord ω) → ((∪ (rank‘𝐴) ⊆ (rank‘𝐴) ∧ (rank‘𝐴) ∈ ω) → ∪ (rank‘𝐴) ∈ ω)) | |
13 | 10, 11, 12 | mp2an 704 | . . . 4 ⊢ ((∪ (rank‘𝐴) ⊆ (rank‘𝐴) ∧ (rank‘𝐴) ∈ ω) → ∪ (rank‘𝐴) ∈ ω) |
14 | 5, 7, 13 | sylancr 694 | . . 3 ⊢ (𝐴 ∈ Hf → ∪ (rank‘𝐴) ∈ ω) |
15 | 1, 14 | syl5eqel 2692 | . 2 ⊢ (𝐴 ∈ Hf → (rank‘∪ 𝐴) ∈ ω) |
16 | uniexg 6853 | . . 3 ⊢ (𝐴 ∈ Hf → ∪ 𝐴 ∈ V) | |
17 | elhf2g 31453 | . . 3 ⊢ (∪ 𝐴 ∈ V → (∪ 𝐴 ∈ Hf ↔ (rank‘∪ 𝐴) ∈ ω)) | |
18 | 16, 17 | syl 17 | . 2 ⊢ (𝐴 ∈ Hf → (∪ 𝐴 ∈ Hf ↔ (rank‘∪ 𝐴) ∈ ω)) |
19 | 15, 18 | mpbird 246 | 1 ⊢ (𝐴 ∈ Hf → ∪ 𝐴 ∈ Hf ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 ∈ wcel 1977 Vcvv 3173 ⊆ wss 3540 ∪ cuni 4372 Tr wtr 4680 Ord word 5639 Oncon0 5640 ‘cfv 5804 ωcom 6957 rankcrnk 8509 Hf chf 31449 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-rep 4699 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-reg 8380 ax-inf2 8421 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-reu 2903 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-int 4411 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-om 6958 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-r1 8510 df-rank 8511 df-hf 31450 |
This theorem is referenced by: (None) |
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