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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 4393 | . . 3 ⊢ 𝑥 ⊆ suc 𝑥 | |
2 | vex 2729 | . . . 4 ⊢ 𝑥 ∈ V | |
3 | 2 | sucex 4476 | . . . 4 ⊢ suc 𝑥 ∈ V |
4 | suceq 4380 | . . . . 5 ⊢ (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥) | |
5 | sucinc.1 | . . . . 5 ⊢ 𝐹 = (𝑧 ∈ V ↦ suc 𝑧) | |
6 | 4, 5 | fvmptg 5562 | . . . 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 3177 | . 2 ⊢ 𝑥 ⊆ (𝐹‘𝑥) |
9 | 8 | ax-gen 1437 | 1 ⊢ ∀𝑥 𝑥 ⊆ (𝐹‘𝑥) |
Colors of variables: wff set class |
Syntax hints: ∀wal 1341 = wceq 1343 ∈ wcel 2136 Vcvv 2726 ⊆ wss 3116 ↦ cmpt 4043 suc csuc 4343 ‘cfv 5188 |
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 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ral 2449 df-rex 2450 df-v 2728 df-sbc 2952 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-mpt 4045 df-id 4271 df-suc 4349 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-iota 5153 df-fun 5190 df-fv 5196 |
This theorem is referenced by: (None) |
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