Theorem frege124d 38053

Description: If 𝐹 is a function, 𝐴 is the successor of 𝑋, and 𝐵 follows 𝑋 in the transitive closure of 𝐹, then 𝐴 and 𝐵 are the same or 𝐵 follows 𝐴 in the transitive closure of 𝐹. Similar to Proposition 124 of [Frege1879] p. 80. Compare with frege124 38281. (Contributed by RP, 16-Jul-2020.)

Hypotheses

Ref	Expression
frege124d.f	⊢ (𝜑 → 𝐹 ∈ V)
frege124d.x	⊢ (𝜑 → 𝑋 ∈ dom 𝐹)
frege124d.a	⊢ (𝜑 → 𝐴 = (𝐹‘𝑋))
frege124d.xb	⊢ (𝜑 → 𝑋(t+‘𝐹)𝐵)
frege124d.fun	⊢ (𝜑 → Fun 𝐹)

Assertion

Ref	Expression
frege124d	⊢ (𝜑 → (𝐴(t+‘𝐹)𝐵 ∨ 𝐴 = 𝐵))

Proof of Theorem frege124d

Dummy variable 𝑎 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		frege124d.a	. . 3 ⊢ (𝜑 → 𝐴 = (𝐹‘𝑋))
2		frege124d.fun	. . . . 5 ⊢ (𝜑 → Fun 𝐹)
3		frege124d.xb	. . . . . . 7 ⊢ (𝜑 → 𝑋(t+‘𝐹)𝐵)
4	1	eqcomd 2628	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹‘𝑋) = 𝐴)
5		frege124d.x	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑋 ∈ dom 𝐹)
6		funbrfvb 6238	. . . . . . . . . . . 12 ⊢ ((Fun 𝐹 ∧ 𝑋 ∈ dom 𝐹) → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
7	2, 5, 6	syl2anc 693	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
8	4, 7	mpbid 222	. . . . . . . . . 10 ⊢ (𝜑 → 𝑋𝐹𝐴)
9		funeu 5913	. . . . . . . . . 10 ⊢ ((Fun 𝐹 ∧ 𝑋𝐹𝐴) → ∃!𝑎 𝑋𝐹𝑎)
10	2, 8, 9	syl2anc 693	. . . . . . . . 9 ⊢ (𝜑 → ∃!𝑎 𝑋𝐹𝑎)
11		fvex 6201	. . . . . . . . . . . . 13 ⊢ (𝐹‘𝑋) ∈ V
12	1, 11	syl6eqel 2709	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐴 ∈ V)
13		sbcan 3478	. . . . . . . . . . . . 13 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ ([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵))
14		sbcbr2g 4710	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹⦋𝐴 / 𝑎⦌𝑎))
15		csbvarg 4003	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ⦋𝐴 / 𝑎⦌𝑎 = 𝐴)
16	15	breq2d 4665	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (𝑋𝐹⦋𝐴 / 𝑎⦌𝑎 ↔ 𝑋𝐹𝐴))
17	14, 16	bitrd 268	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹𝐴))
18		sbcng 3476	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵))
19		sbcbr1g 4709	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵))
20	15	breq1d 4663	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → (⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
21	19, 20	bitrd 268	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
22	21	notbid 308	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
23	18, 22	bitrd 268	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
24	17, 23	anbi12d 747	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ V → (([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
25	13, 24	syl5bb 272	. . . . . . . . . . . 12 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
26	12, 25	syl 17	. . . . . . . . . . 11 ⊢ (𝜑 → ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
27		spesbc 3521	. . . . . . . . . . 11 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵))
28	26, 27	syl6bir 244	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
29	8, 28	mpand 711	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
30		eupicka 2537	. . . . . . . . 9 ⊢ ((∃!𝑎 𝑋𝐹𝑎 ∧ ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)) → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵))
31	10, 29, 30	syl6an 568	. . . . . . . 8 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵)))
32		frege124d.f	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹 ∈ V)
33		funrel 5905	. . . . . . . . . . . . . 14 ⊢ (Fun 𝐹 → Rel 𝐹)
34	2, 33	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → Rel 𝐹)
35		reltrclfv 13758	. . . . . . . . . . . . 13 ⊢ ((𝐹 ∈ V ∧ Rel 𝐹) → Rel (t+‘𝐹))
36	32, 34, 35	syl2anc 693	. . . . . . . . . . . 12 ⊢ (𝜑 → Rel (t+‘𝐹))
37		brrelex2 5157	. . . . . . . . . . . 12 ⊢ ((Rel (t+‘𝐹) ∧ 𝑋(t+‘𝐹)𝐵) → 𝐵 ∈ V)
38	36, 3, 37	syl2anc 693	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ V)
39		brcog 5288	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ dom 𝐹 ∧ 𝐵 ∈ V) → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
40	5, 38, 39	syl2anc 693	. . . . . . . . . 10 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
41	40	notbid 308	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
42		alinexa 1770	. . . . . . . . 9 ⊢ (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵))
43	41, 42	syl6rbbr 279	. . . . . . . 8 ⊢ (𝜑 → (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
44	31, 43	sylibd 229	. . . . . . 7 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
45		brdif 4705	. . . . . . . 8 ⊢ (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 ↔ (𝑋(t+‘𝐹)𝐵 ∧ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
46	45	simplbi2 655	. . . . . . 7 ⊢ (𝑋(t+‘𝐹)𝐵 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 → 𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
47	3, 44, 46	sylsyld 61	. . . . . 6 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
48		trclfvdecomr 38020	. . . . . . . . . . 11 ⊢ (𝐹 ∈ V → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
49	32, 48	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
50		uncom 3757	. . . . . . . . . 10 ⊢ (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹)
51	49, 50	syl6eq 2672	. . . . . . . . 9 ⊢ (𝜑 → (t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
52		eqimss 3657	. . . . . . . . 9 ⊢ ((t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) → (t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
53	51, 52	syl 17	. . . . . . . 8 ⊢ (𝜑 → (t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
54		ssundif 4052	. . . . . . . 8 ⊢ ((t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) ↔ ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
55	53, 54	sylib 208	. . . . . . 7 ⊢ (𝜑 → ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
56	55	ssbrd 4696	. . . . . 6 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 → 𝑋𝐹𝐵))
57	47, 56	syld 47	. . . . 5 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝑋𝐹𝐵))
58		funbrfv 6234	. . . . 5 ⊢ (Fun 𝐹 → (𝑋𝐹𝐵 → (𝐹‘𝑋) = 𝐵))
59	2, 57, 58	sylsyld 61	. . . 4 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → (𝐹‘𝑋) = 𝐵))
60		eqcom 2629	. . . 4 ⊢ ((𝐹‘𝑋) = 𝐵 ↔ 𝐵 = (𝐹‘𝑋))
61	59, 60	syl6ib 241	. . 3 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐵 = (𝐹‘𝑋)))
62		eqtr3 2643	. . 3 ⊢ ((𝐴 = (𝐹‘𝑋) ∧ 𝐵 = (𝐹‘𝑋)) → 𝐴 = 𝐵)
63	1, 61, 62	syl6an 568	. 2 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐴 = 𝐵))
64	63	orrd 393	1 ⊢ (𝜑 → (𝐴(t+‘𝐹)𝐵 ∨ 𝐴 = 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 196   ∨ wo 383   ∧ wa 384  ∀wal 1481   = wceq 1483  ∃wex 1704   ∈ wcel 1990  ∃!weu 2470  Vcvv 3200  [wsbc 3435  ⦋csb 3533   ∖ cdif 3571   ∪ cun 3572   ⊆ wss 3574   class class class wbr 4653  dom cdm 5114   ∘ ccom 5118  Rel wrel 5119  Fun wfun 5882  ‘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-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-fal 1489  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-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-n0 11293  df-z 11378  df-uz 11688  df-fz 12327  df-seq 12802  df-trcl 13726  df-relexp 13761

This theorem is referenced by:  frege126d  38054