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Theorem sucinc 6718
Description: Successor is increasing. (Contributed by Jim Kingdon, 25-Jun-2019.)
Hypothesis
Ref Expression
sucinc.1 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
Assertion
Ref Expression
sucinc 𝑥 𝑥 ⊆ (𝐹𝑥)
Distinct variable group:   𝑥,𝑧
Allowed substitution hints:   𝐹(𝑥, 𝑧)

Proof of Theorem sucinc
StepHypRef Expression
1 sssucid 4560 . . 3 𝑥 ⊆ suc 𝑥
2 vex 2824 . . . 4 𝑥 ∈ V
32sucex 4646 . . . 4 suc 𝑥 ∈ V
4 suceq 4547 . . . . 5 (𝑧 = 𝑥 → suc 𝑧 = suc 𝑥)
5 sucinc.1 . . . . 5 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
64, 5fvmptg 5781 . . . 4 ((𝑥 ∈ V ∧ suc 𝑥 ∈ V) → (𝐹𝑥) = suc 𝑥)
72, 3, 6mp2an 430 . . 3 (𝐹𝑥) = suc 𝑥
81, 7sseqtrri 3283 . 2 𝑥 ⊆ (𝐹𝑥)
98ax-gen 1502 1 𝑥 𝑥 ⊆ (𝐹𝑥)
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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