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Theorem sucinc2 6350
Description: Successor is increasing. (Contributed by Jim Kingdon, 14-Jul-2019.)
Hypothesis
Ref Expression
sucinc.1 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
Assertion
Ref Expression
sucinc2 ((𝐵 ∈ On ∧ 𝐴𝐵) → (𝐹𝐴) ⊆ (𝐹𝐵))
Distinct variable groups:   𝑧,𝐴   𝑧,𝐵
Allowed substitution hint:   𝐹(𝑧)

Proof of Theorem sucinc2
StepHypRef Expression
1 eloni 4305 . . . . 5 (𝐵 ∈ On → Ord 𝐵)
2 ordsucss 4428 . . . . 5 (Ord 𝐵 → (𝐴𝐵 → suc 𝐴𝐵))
31, 2syl 14 . . . 4 (𝐵 ∈ On → (𝐴𝐵 → suc 𝐴𝐵))
43imp 123 . . 3 ((𝐵 ∈ On ∧ 𝐴𝐵) → suc 𝐴𝐵)
5 sssucid 4345 . . 3 𝐵 ⊆ suc 𝐵
64, 5sstrdi 3114 . 2 ((𝐵 ∈ On ∧ 𝐴𝐵) → suc 𝐴 ⊆ suc 𝐵)
7 onelon 4314 . . 3 ((𝐵 ∈ On ∧ 𝐴𝐵) → 𝐴 ∈ On)
8 elex 2700 . . . 4 (𝐴 ∈ On → 𝐴 ∈ V)
9 sucexg 4422 . . . 4 (𝐴 ∈ On → suc 𝐴 ∈ V)
10 suceq 4332 . . . . 5 (𝑧 = 𝐴 → suc 𝑧 = suc 𝐴)
11 sucinc.1 . . . . 5 𝐹 = (𝑧 ∈ V ↦ suc 𝑧)
1210, 11fvmptg 5505 . . . 4 ((𝐴 ∈ V ∧ suc 𝐴 ∈ V) → (𝐹𝐴) = suc 𝐴)
138, 9, 12syl2anc 409 . . 3 (𝐴 ∈ On → (𝐹𝐴) = suc 𝐴)
147, 13syl 14 . 2 ((𝐵 ∈ On ∧ 𝐴𝐵) → (𝐹𝐴) = suc 𝐴)
15 elex 2700 . . . 4 (𝐵 ∈ On → 𝐵 ∈ V)
16 sucexg 4422 . . . 4 (𝐵 ∈ On → suc 𝐵 ∈ V)
17 suceq 4332 . . . . 5 (𝑧 = 𝐵 → suc 𝑧 = suc 𝐵)
1817, 11fvmptg 5505 . . . 4 ((𝐵 ∈ V ∧ suc 𝐵 ∈ V) → (𝐹𝐵) = suc 𝐵)
1915, 16, 18syl2anc 409 . . 3 (𝐵 ∈ On → (𝐹𝐵) = suc 𝐵)
2019adantr 274 . 2 ((𝐵 ∈ On ∧ 𝐴𝐵) → (𝐹𝐵) = suc 𝐵)
216, 14, 203sstr4d 3147 1 ((𝐵 ∈ On ∧ 𝐴𝐵) → (𝐹𝐴) ⊆ (𝐹𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103   = wceq 1332  wcel 1481  Vcvv 2689  wss 3076  cmpt 3997  Ord word 4292  Oncon0 4293  suc csuc 4295  cfv 5131
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 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139  ax-un 4363
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-sbc 2914  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-uni 3745  df-br 3938  df-opab 3998  df-mpt 3999  df-tr 4035  df-id 4223  df-iord 4296  df-on 4298  df-suc 4301  df-xp 4553  df-rel 4554  df-cnv 4555  df-co 4556  df-dm 4557  df-iota 5096  df-fun 5133  df-fv 5139
This theorem is referenced by: (None)
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