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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 4560 | . . 3 ⊢ 𝑥 ⊆ suc 𝑥 | |
| 2 | vex 2824 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | sucex 4646 | . . . 4 ⊢ suc 𝑥 ∈ V |
| 4 | suceq 4547 | . . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥) | |
| 5 | sucinc.1 | . . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) | |
| 6 | 4, 5 | fvmptg 5781 | . . . 4 ⊢ ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹‘𝑥) = suc 𝑥) |
| 7 | 2, 3, 6 | mp2an 430 | . . 3 ⊢ (𝐹‘𝑥) = suc 𝑥 |
| 8 | 1, 7 | sseqtrri 3283 | . 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥) |
| 9 | 8 | ax-gen 1502 | 1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∀wal 1400 = wceq 1402 ∈ wcel 2209 Vcvv 2821 ⊆ wss 3220 ↦ cmpt 4192 suc csuc 4510 ‘cfv 5377 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-sbc 3052 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-mpt 4194 df-id 4438 df-suc 4516 df-xp 4780 df-rel 4781 df-cnv 4782 df-co 4783 df-dm 4784 df-iota 5337 df-fun 5379 df-fv 5385 |
| This theorem is used by: (None) |
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