Theorem frege111d 38051

Description: If either A and C are the same or C follows A in the transitive closure of R and B is the successor to C, then either A and B are the same or A follows B or B and A in the transitive closure of R. Similar to Proposition 111 of [Frege1879] p. 75. Compare with frege111 38268. (Contributed by RP, 15-Jul-2020.)

Hypotheses

Ref	Expression
frege111d.r	|- ( ph -> R e. _V )
frege111d.a	|- ( ph -> A e. _V )
frege111d.b	|- ( ph -> B e. _V )
frege111d.c	|- ( ph -> C e. _V )
frege111d.ac	|- ( ph -> ( A ( t+ ` R ) C \/ A = C ) )
frege111d.cb	|- ( ph -> C R B )

Assertion

Ref	Expression
frege111d	|- ( ph -> ( A ( t+ ` R ) B \/ A = B \/ B ( t+ ` R ) A ) )

Proof of Theorem frege111d

Step	Hyp	Ref	Expression
1		frege111d.r	. . 3 |- ( ph -> R e. _V )
2		frege111d.a	. . 3 |- ( ph -> A e. _V )
3		frege111d.b	. . 3 |- ( ph -> B e. _V )
4		frege111d.c	. . 3 |- ( ph -> C e. _V )
5		frege111d.ac	. . 3 |- ( ph -> ( A ( t+ ` R ) C \/ A = C ) )
6		frege111d.cb	. . 3 |- ( ph -> C R B )
7	1, 2, 3, 4, 5, 6	frege108d 38048	. 2 |- ( ph -> ( A ( t+ ` R ) B \/ A = B ) )
8	7	frege114d 38050	1 |- ( ph -> ( A ( t+ ` R ) B \/ A = B \/ B ( t+ ` R ) A ) )

Syntax hints:   -> wi 4   \/ wo 383   \/ w3o 1036   = wceq 1483   e. wcel 1990   _Vcvv 3200   class class class wbr 4653   ` cfv 5888   t+ctcl 13724

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-int 4476  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-iota 5851  df-fun 5890  df-fv 5896  df-trcl 13726

This theorem is referenced by: (None)