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Mirrors > Home > ILE Home > Th. List > nninfisollemeq | GIF version |
Description: Lemma for nninfisol 7088. The case where 𝑁 is a successor and 𝑁 and 𝑋 are equal. (Contributed by Jim Kingdon, 13-Sep-2024.) |
Ref | Expression |
---|---|
nninfisol.x | ⊢ (𝜑 → 𝑋 ∈ ℕ∞) |
nninfisol.0 | ⊢ (𝜑 → (𝑋‘𝑁) = ∅) |
nninfisol.n | ⊢ (𝜑 → 𝑁 ∈ ω) |
nninfisollemeq.s | ⊢ (𝜑 → 𝑁 ≠ ∅) |
nninfisollemeq.0 | ⊢ (𝜑 → (𝑋‘∪ 𝑁) = 1o) |
Ref | Expression |
---|---|
nninfisollemeq | ⊢ (𝜑 → DECID (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nninfisol.x | . . . . 5 ⊢ (𝜑 → 𝑋 ∈ ℕ∞) | |
2 | nninfisol.n | . . . . 5 ⊢ (𝜑 → 𝑁 ∈ ω) | |
3 | nninfisollemeq.0 | . . . . 5 ⊢ (𝜑 → (𝑋‘∪ 𝑁) = 1o) | |
4 | nninfisol.0 | . . . . 5 ⊢ (𝜑 → (𝑋‘𝑁) = ∅) | |
5 | 1, 2, 3, 4 | nnnninfeq2 7084 | . . . 4 ⊢ (𝜑 → 𝑋 = (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅))) |
6 | 5 | eqcomd 2170 | . . 3 ⊢ (𝜑 → (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋) |
7 | 6 | orcd 723 | . 2 ⊢ (𝜑 → ((𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋 ∨ ¬ (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋)) |
8 | df-dc 825 | . 2 ⊢ (DECID (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋 ↔ ((𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋 ∨ ¬ (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋)) | |
9 | 7, 8 | sylibr 133 | 1 ⊢ (𝜑 → DECID (𝑖 ∈ ω ↦ if(𝑖 ∈ 𝑁, 1o, ∅)) = 𝑋) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∨ wo 698 DECID wdc 824 = wceq 1342 ∈ wcel 2135 ≠ wne 2334 ∅c0 3404 ifcif 3515 ∪ cuni 3783 ↦ cmpt 4037 ωcom 4561 ‘cfv 5182 1oc1o 6368 ℕ∞xnninf 7075 |
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 ax-setind 4508 ax-iinf 4559 |
This theorem depends on definitions: df-bi 116 df-dc 825 df-3or 968 df-3an 969 df-tru 1345 df-fal 1348 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-ne 2335 df-ral 2447 df-rex 2448 df-rab 2451 df-v 2723 df-sbc 2947 df-csb 3041 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-if 3516 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-mpt 4039 df-tr 4075 df-id 4265 df-iord 4338 df-on 4340 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-iota 5147 df-fun 5184 df-fn 5185 df-f 5186 df-fv 5190 df-ov 5839 df-oprab 5840 df-mpo 5841 df-1o 6375 df-2o 6376 df-map 6607 df-nninf 7076 |
This theorem is referenced by: nninfisol 7088 |
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