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Mirrors > Home > MPE Home > Th. List > 0sdom1domALT | Structured version Visualization version GIF version |
Description: Alternate proof of 0sdom1dom 9252, shorter but requiring ax-un 7732. (Contributed by NM, 28-Sep-2004.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
0sdom1domALT | ⊢ (∅ ≺ 𝐴 ↔ 1o ≼ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano1 7886 | . . 3 ⊢ ∅ ∈ ω | |
2 | sucdom 9249 | . . 3 ⊢ (∅ ∈ ω → (∅ ≺ 𝐴 ↔ suc ∅ ≼ 𝐴)) | |
3 | 1, 2 | ax-mp 5 | . 2 ⊢ (∅ ≺ 𝐴 ↔ suc ∅ ≼ 𝐴) |
4 | df-1o 8478 | . . 3 ⊢ 1o = suc ∅ | |
5 | 4 | breq1i 5149 | . 2 ⊢ (1o ≼ 𝐴 ↔ suc ∅ ≼ 𝐴) |
6 | 3, 5 | bitr4i 278 | 1 ⊢ (∅ ≺ 𝐴 ↔ 1o ≼ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∈ wcel 2099 ∅c0 4318 class class class wbr 5142 suc csuc 6365 ωcom 7862 1oc1o 8471 ≼ cdom 8951 ≺ csdm 8952 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-sep 5293 ax-nul 5300 ax-pr 5423 ax-un 7732 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-ral 3057 df-rex 3066 df-reu 3372 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-pss 3963 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-om 7863 df-1o 8478 df-en 8954 df-dom 8955 df-sdom 8956 df-fin 8957 |
This theorem is referenced by: (None) |
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