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Mirrors > Home > ILE Home > Th. List > sucinc | GIF version |
Description: Successor is increasing. (Contributed by Jim Kingdon, 25-Jun-2019.) |
Ref | Expression |
---|---|
sucinc.1 | ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) |
Ref | Expression |
---|---|
sucinc | ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sssucid 4387 | . . 3 ⊢ 𝑥 ⊆ suc 𝑥 | |
2 | vex 2724 | . . . 4 ⊢ 𝑥 ∈ V | |
3 | 2 | sucex 4470 | . . . 4 ⊢ suc 𝑥 ∈ V |
4 | suceq 4374 | . . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥) | |
5 | sucinc.1 | . . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) | |
6 | 4, 5 | fvmptg 5556 | . . . 4 ⊢ ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹‘𝑥) = suc 𝑥) |
7 | 2, 3, 6 | mp2an 423 | . . 3 ⊢ (𝐹‘𝑥) = suc 𝑥 |
8 | 1, 7 | sseqtrri 3172 | . 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥) |
9 | 8 | ax-gen 1436 | 1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥) |
Colors of variables: wff set class |
Syntax hints: ∀wal 1340 = wceq 1342 ∈ wcel 2135 Vcvv 2721 ⊆ wss 3111 ↦ cmpt 4037 suc csuc 4337 ‘cfv 5182 |
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 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-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 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-ral 2447 df-rex 2448 df-v 2723 df-sbc 2947 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-br 3977 df-opab 4038 df-mpt 4039 df-id 4265 df-suc 4343 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-iota 5147 df-fun 5184 df-fv 5190 |
This theorem is referenced by: (None) |
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