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Mirrors > Home > MPE Home > Th. List > isfin5-2 | Structured version Visualization version GIF version |
Description: Alternate definition of V-finite which emphasizes the idempotent behavior of V-infinite sets. (Contributed by Stefan O'Rear, 30-Oct-2014.) (Revised by Mario Carneiro, 17-May-2015.) |
Ref | Expression |
---|---|
isfin5-2 | ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ FinV ↔ ¬ (𝐴 ≠ ∅ ∧ 𝐴 ≈ (𝐴 +𝑐 𝐴)))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nne 2798 | . . . . 5 ⊢ (¬ 𝐴 ≠ ∅ ↔ 𝐴 = ∅) | |
2 | 1 | bicomi 214 | . . . 4 ⊢ (𝐴 = ∅ ↔ ¬ 𝐴 ≠ ∅) |
3 | 2 | a1i 11 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝐴 = ∅ ↔ ¬ 𝐴 ≠ ∅)) |
4 | cdadom3 9010 | . . . . 5 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐴 ∈ 𝑉) → 𝐴 ≼ (𝐴 +𝑐 𝐴)) | |
5 | 4 | anidms 677 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≼ (𝐴 +𝑐 𝐴)) |
6 | brsdom 7978 | . . . . 5 ⊢ (𝐴 ≺ (𝐴 +𝑐 𝐴) ↔ (𝐴 ≼ (𝐴 +𝑐 𝐴) ∧ ¬ 𝐴 ≈ (𝐴 +𝑐 𝐴))) | |
7 | 6 | baib 944 | . . . 4 ⊢ (𝐴 ≼ (𝐴 +𝑐 𝐴) → (𝐴 ≺ (𝐴 +𝑐 𝐴) ↔ ¬ 𝐴 ≈ (𝐴 +𝑐 𝐴))) |
8 | 5, 7 | syl 17 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ≺ (𝐴 +𝑐 𝐴) ↔ ¬ 𝐴 ≈ (𝐴 +𝑐 𝐴))) |
9 | 3, 8 | orbi12d 746 | . 2 ⊢ (𝐴 ∈ 𝑉 → ((𝐴 = ∅ ∨ 𝐴 ≺ (𝐴 +𝑐 𝐴)) ↔ (¬ 𝐴 ≠ ∅ ∨ ¬ 𝐴 ≈ (𝐴 +𝑐 𝐴)))) |
10 | isfin5 9121 | . 2 ⊢ (𝐴 ∈ FinV ↔ (𝐴 = ∅ ∨ 𝐴 ≺ (𝐴 +𝑐 𝐴))) | |
11 | ianor 509 | . 2 ⊢ (¬ (𝐴 ≠ ∅ ∧ 𝐴 ≈ (𝐴 +𝑐 𝐴)) ↔ (¬ 𝐴 ≠ ∅ ∨ ¬ 𝐴 ≈ (𝐴 +𝑐 𝐴))) | |
12 | 9, 10, 11 | 3bitr4g 303 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ FinV ↔ ¬ (𝐴 ≠ ∅ ∧ 𝐴 ≈ (𝐴 +𝑐 𝐴)))) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 196 ∨ wo 383 ∧ wa 384 = wceq 1483 ∈ wcel 1990 ≠ wne 2794 ∅c0 3915 class class class wbr 4653 (class class class)co 6650 ≈ cen 7952 ≼ cdom 7953 ≺ csdm 7954 +𝑐 ccda 8989 FinVcfin5 9104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3or 1038 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-tp 4182 df-op 4184 df-uni 4437 df-int 4476 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 df-eprel 5029 df-po 5035 df-so 5036 df-fr 5073 df-we 5075 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-ord 5726 df-on 5727 df-suc 5729 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-1o 7560 df-er 7742 df-en 7956 df-dom 7957 df-sdom 7958 df-cda 8990 df-fin5 9111 |
This theorem is referenced by: fin45 9214 |
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