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Mirrors > Home > ILE Home > Th. List > sucinc2 | GIF version |
Description: Successor is increasing. (Contributed by Jim Kingdon, 14-Jul-2019.) |
Ref | Expression |
---|---|
sucinc.1 | ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) |
Ref | Expression |
---|---|
sucinc2 | ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → (𝐹‘𝐴) ⊆ (𝐹‘𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eloni 4305 | . . . . 5 ⊢ (𝐵 ∈ On → Ord 𝐵) | |
2 | ordsucss 4428 | . . . . 5 ⊢ (Ord 𝐵 → (𝐴 ∈ 𝐵 → suc 𝐴 ⊆ 𝐵)) | |
3 | 1, 2 | syl 14 | . . . 4 ⊢ (𝐵 ∈ On → (𝐴 ∈ 𝐵 → suc 𝐴 ⊆ 𝐵)) |
4 | 3 | imp 123 | . . 3 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → suc 𝐴 ⊆ 𝐵) |
5 | sssucid 4345 | . . 3 ⊢ 𝐵 ⊆ suc 𝐵 | |
6 | 4, 5 | sstrdi 3114 | . 2 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → suc 𝐴 ⊆ suc 𝐵) |
7 | onelon 4314 | . . 3 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → 𝐴 ∈ On) | |
8 | elex 2700 | . . . 4 ⊢ (𝐴 ∈ On → 𝐴 ∈ V) | |
9 | sucexg 4422 | . . . 4 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ V) | |
10 | suceq 4332 | . . . . 5 ⊢ (𝑧 = 𝐴 → suc 𝑧 = suc 𝐴) | |
11 | sucinc.1 | . . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) | |
12 | 10, 11 | fvmptg 5505 | . . . 4 ⊢ ((𝐴 ∈ V ∧ suc 𝐴 ∈ V) → (𝐹‘𝐴) = suc 𝐴) |
13 | 8, 9, 12 | syl2anc 409 | . . 3 ⊢ (𝐴 ∈ On → (𝐹‘𝐴) = suc 𝐴) |
14 | 7, 13 | syl 14 | . 2 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → (𝐹‘𝐴) = suc 𝐴) |
15 | elex 2700 | . . . 4 ⊢ (𝐵 ∈ On → 𝐵 ∈ V) | |
16 | sucexg 4422 | . . . 4 ⊢ (𝐵 ∈ On → suc 𝐵 ∈ V) | |
17 | suceq 4332 | . . . . 5 ⊢ (𝑧 = 𝐵 → suc 𝑧 = suc 𝐵) | |
18 | 17, 11 | fvmptg 5505 | . . . 4 ⊢ ((𝐵 ∈ V ∧ suc 𝐵 ∈ V) → (𝐹‘𝐵) = suc 𝐵) |
19 | 15, 16, 18 | syl2anc 409 | . . 3 ⊢ (𝐵 ∈ On → (𝐹‘𝐵) = suc 𝐵) |
20 | 19 | adantr 274 | . 2 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → (𝐹‘𝐵) = suc 𝐵) |
21 | 6, 14, 20 | 3sstr4d 3147 | 1 ⊢ ((𝐵 ∈ On ∧ 𝐴 ∈ 𝐵) → (𝐹‘𝐴) ⊆ (𝐹‘𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1332 ∈ wcel 1481 Vcvv 2689 ⊆ wss 3076 ↦ cmpt 3997 Ord word 4292 Oncon0 4293 suc csuc 4295 ‘cfv 5131 |
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-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 ax-un 4363 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ral 2422 df-rex 2423 df-v 2691 df-sbc 2914 df-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-iord 4296 df-on 4298 df-suc 4301 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-iota 5096 df-fun 5133 df-fv 5139 |
This theorem is referenced by: (None) |
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