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Mirrors > Home > MPE Home > Th. List > Mathboxes > noreson | Structured version Visualization version GIF version |
Description: The restriction of a surreal to an ordinal is still a surreal. (Contributed by Scott Fenton, 4-Sep-2011.) |
Ref | Expression |
---|---|
noreson | ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ On) → (𝐴 ↾ 𝐵) ∈ No ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elno 31799 | . . 3 ⊢ (𝐴 ∈ No ↔ ∃𝑥 ∈ On 𝐴:𝑥⟶{1𝑜, 2𝑜}) | |
2 | onin 5754 | . . . . . . . 8 ⊢ ((𝑥 ∈ On ∧ 𝐵 ∈ On) → (𝑥 ∩ 𝐵) ∈ On) | |
3 | fresin 6073 | . . . . . . . 8 ⊢ (𝐴:𝑥⟶{1𝑜, 2𝑜} → (𝐴 ↾ 𝐵):(𝑥 ∩ 𝐵)⟶{1𝑜, 2𝑜}) | |
4 | feq2 6027 | . . . . . . . . 9 ⊢ (𝑦 = (𝑥 ∩ 𝐵) → ((𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜} ↔ (𝐴 ↾ 𝐵):(𝑥 ∩ 𝐵)⟶{1𝑜, 2𝑜})) | |
5 | 4 | rspcev 3309 | . . . . . . . 8 ⊢ (((𝑥 ∩ 𝐵) ∈ On ∧ (𝐴 ↾ 𝐵):(𝑥 ∩ 𝐵)⟶{1𝑜, 2𝑜}) → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) |
6 | 2, 3, 5 | syl2an 494 | . . . . . . 7 ⊢ (((𝑥 ∈ On ∧ 𝐵 ∈ On) ∧ 𝐴:𝑥⟶{1𝑜, 2𝑜}) → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) |
7 | 6 | an32s 846 | . . . . . 6 ⊢ (((𝑥 ∈ On ∧ 𝐴:𝑥⟶{1𝑜, 2𝑜}) ∧ 𝐵 ∈ On) → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) |
8 | 7 | ex 450 | . . . . 5 ⊢ ((𝑥 ∈ On ∧ 𝐴:𝑥⟶{1𝑜, 2𝑜}) → (𝐵 ∈ On → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜})) |
9 | 8 | rexlimiva 3028 | . . . 4 ⊢ (∃𝑥 ∈ On 𝐴:𝑥⟶{1𝑜, 2𝑜} → (𝐵 ∈ On → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜})) |
10 | 9 | imp 445 | . . 3 ⊢ ((∃𝑥 ∈ On 𝐴:𝑥⟶{1𝑜, 2𝑜} ∧ 𝐵 ∈ On) → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) |
11 | 1, 10 | sylanb 489 | . 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ On) → ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) |
12 | elno 31799 | . 2 ⊢ ((𝐴 ↾ 𝐵) ∈ No ↔ ∃𝑦 ∈ On (𝐴 ↾ 𝐵):𝑦⟶{1𝑜, 2𝑜}) | |
13 | 11, 12 | sylibr 224 | 1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ On) → (𝐴 ↾ 𝐵) ∈ No ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∈ wcel 1990 ∃wrex 2913 ∩ cin 3573 {cpr 4179 ↾ cres 5116 Oncon0 5723 ⟶wf 5884 1𝑜c1o 7553 2𝑜c2o 7554 No csur 31793 |
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-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-rep 4771 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 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-reu 2919 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-tr 4753 df-id 5024 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-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-fv 5896 df-no 31796 |
This theorem is referenced by: sltres 31815 nodenselem6 31839 noresle 31846 nosupbnd1lem1 31854 nosupbnd1lem2 31855 nosupbnd1lem6 31859 nosupbnd1 31860 nosupbnd2lem1 31861 nosupbnd2 31862 noetalem3 31865 |
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