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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 4541 | . . 3 ⊢ 𝑥 ⊆ suc 𝑥 | |
| 2 | vex 2818 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | sucex 4626 | . . . 4 ⊢ suc 𝑥 ∈ V |
| 4 | suceq 4528 | . . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥) | |
| 5 | sucinc.1 | . . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) | |
| 6 | 4, 5 | fvmptg 5758 | . . . 4 ⊢ ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹‘𝑥) = suc 𝑥) |
| 7 | 2, 3, 6 | mp2an 426 | . . 3 ⊢ (𝐹‘𝑥) = suc 𝑥 |
| 8 | 1, 7 | sseqtrri 3277 | . 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥) |
| 9 | 8 | ax-gen 1498 | 1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥) |
| Colors of variables: wff set class |
| Syntax hints: ∀wal 1396 = wceq 1398 ∈ wcel 2205 Vcvv 2815 ⊆ wss 3214 ↦ cmpt 4176 suc csuc 4491 ‘cfv 5357 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 ax-pr 4327 ax-un 4559 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ral 2527 df-rex 2528 df-v 2817 df-sbc 3046 df-un 3218 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 df-pr 3701 df-op 3703 df-uni 3920 df-br 4115 df-opab 4177 df-mpt 4178 df-id 4419 df-suc 4497 df-xp 4760 df-rel 4761 df-cnv 4762 df-co 4763 df-dm 4764 df-iota 5317 df-fun 5359 df-fv 5365 |
| This theorem is referenced by: (None) |
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