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| Mirrors > Home > MPE Home > Th. List > smofvon2 | Structured version Visualization version GIF version | ||
| Description: The function values of a strictly monotone ordinal function are ordinals. (Contributed by Mario Carneiro, 12-Mar-2013.) |
| Ref | Expression |
|---|---|
| smofvon2 | ⊢ (Smo 𝐹 → (𝐹‘𝐵) ∈ On) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfsmo2 8316 | . . . 4 ⊢ (Smo 𝐹 ↔ (𝐹:dom 𝐹⟶On ∧ Ord dom 𝐹 ∧ ∀𝑥 ∈ dom 𝐹∀𝑦 ∈ 𝑥 (𝐹‘𝑦) ∈ (𝐹‘𝑥))) | |
| 2 | 1 | simp1bi 1145 | . . 3 ⊢ (Smo 𝐹 → 𝐹:dom 𝐹⟶On) |
| 3 | ffvelcdm 7053 | . . . 4 ⊢ ((𝐹:dom 𝐹⟶On ∧ 𝐵 ∈ dom 𝐹) → (𝐹‘𝐵) ∈ On) | |
| 4 | 3 | expcom 413 | . . 3 ⊢ (𝐵 ∈ dom 𝐹 → (𝐹:dom 𝐹⟶On → (𝐹‘𝐵) ∈ On)) |
| 5 | 2, 4 | syl5 34 | . 2 ⊢ (𝐵 ∈ dom 𝐹 → (Smo 𝐹 → (𝐹‘𝐵) ∈ On)) |
| 6 | ndmfv 6893 | . . . 4 ⊢ (¬ 𝐵 ∈ dom 𝐹 → (𝐹‘𝐵) = ∅) | |
| 7 | 0elon 6387 | . . . 4 ⊢ ∅ ∈ On | |
| 8 | 6, 7 | eqeltrdi 2836 | . . 3 ⊢ (¬ 𝐵 ∈ dom 𝐹 → (𝐹‘𝐵) ∈ On) |
| 9 | 8 | a1d 25 | . 2 ⊢ (¬ 𝐵 ∈ dom 𝐹 → (Smo 𝐹 → (𝐹‘𝐵) ∈ On)) |
| 10 | 5, 9 | pm2.61i 182 | 1 ⊢ (Smo 𝐹 → (𝐹‘𝐵) ∈ On) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∈ wcel 2109 ∀wral 3044 ∅c0 4296 dom cdm 5638 Ord word 6331 Oncon0 6332 ⟶wf 6507 ‘cfv 6511 Smo wsmo 8314 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pr 5387 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-ne 2926 df-ral 3045 df-rex 3054 df-rab 3406 df-v 3449 df-dif 3917 df-un 3919 df-ss 3931 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-tr 5215 df-id 5533 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-ord 6335 df-on 6336 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-fv 6519 df-smo 8315 |
| This theorem is referenced by: smo11 8333 smoord 8334 smoword 8335 smogt 8336 |
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