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Mirrors > Home > ILE Home > Th. List > snfig | GIF version |
Description: A singleton is finite. For the proper class case, see snprc 3635. (Contributed by Jim Kingdon, 13-Apr-2020.) |
Ref | Expression |
---|---|
snfig | ⊢ (𝐴 ∈ 𝑉 → {𝐴} ∈ Fin) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1onn 6479 | . . 3 ⊢ 1o ∈ ω | |
2 | ensn1g 6754 | . . 3 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≈ 1o) | |
3 | breq2 3980 | . . . 4 ⊢ (𝑥 = 1o → ({𝐴} ≈ 𝑥 ↔ {𝐴} ≈ 1o)) | |
4 | 3 | rspcev 2825 | . . 3 ⊢ ((1o ∈ ω ∧ {𝐴} ≈ 1o) → ∃𝑥 ∈ ω {𝐴} ≈ 𝑥) |
5 | 1, 2, 4 | sylancr 411 | . 2 ⊢ (𝐴 ∈ 𝑉 → ∃𝑥 ∈ ω {𝐴} ≈ 𝑥) |
6 | isfi 6718 | . 2 ⊢ ({𝐴} ∈ Fin ↔ ∃𝑥 ∈ ω {𝐴} ≈ 𝑥) | |
7 | 5, 6 | sylibr 133 | 1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ∈ Fin) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2135 ∃wrex 2443 {csn 3570 class class class wbr 3976 ωcom 4561 1oc1o 6368 ≈ cen 6695 Fincfn 6697 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-nul 4102 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-br 3977 df-opab 4038 df-id 4265 df-suc 4343 df-iom 4562 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 df-1o 6375 df-en 6698 df-fin 6700 |
This theorem is referenced by: fiprc 6772 ssfiexmid 6833 domfiexmid 6835 diffitest 6844 unfiexmid 6874 prfidisj 6883 tpfidisj 6884 ssfii 6930 infpwfidom 7145 hashsng 10700 fihashen1 10701 hashunsng 10709 hashprg 10710 hashdifsn 10721 hashdifpr 10722 hashxp 10728 fsumsplitsnun 11346 fsum2dlemstep 11361 fisumcom2 11365 fsumconst 11381 fsumge1 11388 fsum00 11389 hash2iun1dif1 11407 fprod2dlemstep 11549 fprodcom2fi 11553 fprodsplitsn 11560 fprodsplit1f 11561 phicl2 12123 |
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