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Theorem sucinc 6498
Description: Successor is increasing. (Contributed by Jim Kingdon, 25-Jun-2019.)
Hypothesis
Ref Expression
sucinc.1  |-  F  =  ( z  e.  _V  |->  suc  z )
Assertion
Ref Expression
sucinc  |-  A. x  x  C_  ( F `  x )
Distinct variable group:    x, z
Allowed substitution hints:    F( x, z)

Proof of Theorem sucinc
StepHypRef Expression
1 sssucid 4446 . . 3  |-  x  C_  suc  x
2 vex 2763 . . . 4  |-  x  e. 
_V
32sucex 4531 . . . 4  |-  suc  x  e.  _V
4 suceq 4433 . . . . 5  |-  ( z  =  x  ->  suc  z  =  suc  x )
5 sucinc.1 . . . . 5  |-  F  =  ( z  e.  _V  |->  suc  z )
64, 5fvmptg 5633 . . . 4  |-  ( ( x  e.  _V  /\  suc  x  e.  _V )  ->  ( F `  x
)  =  suc  x
)
72, 3, 6mp2an 426 . . 3  |-  ( F `
 x )  =  suc  x
81, 7sseqtrri 3214 . 2  |-  x  C_  ( F `  x )
98ax-gen 1460 1  |-  A. x  x  C_  ( F `  x )
Colors of variables: wff set class
Syntax hints:   A.wal 1362    = wceq 1364    e. wcel 2164   _Vcvv 2760    C_ wss 3153    |-> cmpt 4090   suc csuc 4396   ` cfv 5254
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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-sbc 2986  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4324  df-suc 4402  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-iota 5215  df-fun 5256  df-fv 5262
This theorem is referenced by: (None)
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