Theorem frege124d 40099

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 40326. (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 2827	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹‘𝑋) = 𝐴)
5		frege124d.x	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑋 ∈ dom 𝐹)
6		funbrfvb 6715	. . . . . . . . . . . 12 ⊢ ((Fun 𝐹 ∧ 𝑋 ∈ dom 𝐹) → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
7	2, 5, 6	syl2anc 586	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
8	4, 7	mpbid 234	. . . . . . . . . 10 ⊢ (𝜑 → 𝑋𝐹𝐴)
9		funeu 6375	. . . . . . . . . 10 ⊢ ((Fun 𝐹 ∧ 𝑋𝐹𝐴) → ∃!𝑎 𝑋𝐹𝑎)
10	2, 8, 9	syl2anc 586	. . . . . . . . 9 ⊢ (𝜑 → ∃!𝑎 𝑋𝐹𝑎)
11		fvex 6678	. . . . . . . . . . . . 13 ⊢ (𝐹‘𝑋) ∈ V
12	1, 11	eqeltrdi 2921	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐴 ∈ V)
13		sbcan 3821	. . . . . . . . . . . . 13 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ ([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵))
14		sbcbr2g 5117	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹⦋𝐴 / 𝑎⦌𝑎))
15		csbvarg 4383	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ⦋𝐴 / 𝑎⦌𝑎 = 𝐴)
16	15	breq2d 5071	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (𝑋𝐹⦋𝐴 / 𝑎⦌𝑎 ↔ 𝑋𝐹𝐴))
17	14, 16	bitrd 281	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹𝐴))
18		sbcng 3819	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵))
19		sbcbr1g 5116	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵))
20	15	breq1d 5069	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → (⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
21	19, 20	bitrd 281	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
22	21	notbid 320	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
23	18, 22	bitrd 281	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
24	17, 23	anbi12d 632	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ V → (([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
25	13, 24	syl5bb 285	. . . . . . . . . . . 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 3865	. . . . . . . . . . 11 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵))
28	26, 27	syl6bir 256	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
29	8, 28	mpand 693	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
30		eupicka 2715	. . . . . . . . 9 ⊢ ((∃!𝑎 𝑋𝐹𝑎 ∧ ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)) → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵))
31	10, 29, 30	syl6an 682	. . . . . . . 8 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵)))
32		frege124d.f	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹 ∈ V)
33		funrel 6367	. . . . . . . . . . . . . 14 ⊢ (Fun 𝐹 → Rel 𝐹)
34	2, 33	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → Rel 𝐹)
35		reltrclfv 14371	. . . . . . . . . . . . 13 ⊢ ((𝐹 ∈ V ∧ Rel 𝐹) → Rel (t+‘𝐹))
36	32, 34, 35	syl2anc 586	. . . . . . . . . . . 12 ⊢ (𝜑 → Rel (t+‘𝐹))
37		brrelex2 5601	. . . . . . . . . . . 12 ⊢ ((Rel (t+‘𝐹) ∧ 𝑋(t+‘𝐹)𝐵) → 𝐵 ∈ V)
38	36, 3, 37	syl2anc 586	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ V)
39		brcog 5732	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ dom 𝐹 ∧ 𝐵 ∈ V) → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
40	5, 38, 39	syl2anc 586	. . . . . . . . . 10 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
41	40	notbid 320	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
42		alinexa 1839	. . . . . . . . 9 ⊢ (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵))
43	41, 42	syl6rbbr 292	. . . . . . . 8 ⊢ (𝜑 → (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
44	31, 43	sylibd 241	. . . . . . 7 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
45		brdif 5112	. . . . . . . 8 ⊢ (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 ↔ (𝑋(t+‘𝐹)𝐵 ∧ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
46	45	simplbi2 503	. . . . . . 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 40066	. . . . . . . . . . 11 ⊢ (𝐹 ∈ V → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
49	32, 48	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
50		uncom 4129	. . . . . . . . . 10 ⊢ (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹)
51	49, 50	syl6eq 2872	. . . . . . . . 9 ⊢ (𝜑 → (t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
52		eqimss 4023	. . . . . . . . 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 4433	. . . . . . . 8 ⊢ ((t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) ↔ ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
55	53, 54	sylib 220	. . . . . . 7 ⊢ (𝜑 → ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
56	55	ssbrd 5102	. . . . . 6 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 → 𝑋𝐹𝐵))
57	47, 56	syld 47	. . . . 5 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝑋𝐹𝐵))
58		funbrfv 6711	. . . . 5 ⊢ (Fun 𝐹 → (𝑋𝐹𝐵 → (𝐹‘𝑋) = 𝐵))
59	2, 57, 58	sylsyld 61	. . . 4 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → (𝐹‘𝑋) = 𝐵))
60		eqcom 2828	. . . 4 ⊢ ((𝐹‘𝑋) = 𝐵 ↔ 𝐵 = (𝐹‘𝑋))
61	59, 60	syl6ib 253	. . 3 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐵 = (𝐹‘𝑋)))
62		eqtr3 2843	. . 3 ⊢ ((𝐴 = (𝐹‘𝑋) ∧ 𝐵 = (𝐹‘𝑋)) → 𝐴 = 𝐵)
63	1, 61, 62	syl6an 682	. 2 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐴 = 𝐵))
64	63	orrd 859	1 ⊢ (𝜑 → (𝐴(t+‘𝐹)𝐵 ∨ 𝐴 = 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   ∨ wo 843  ∀wal 1531   = wceq 1533  ∃wex 1776   ∈ wcel 2110  ∃!weu 2649  Vcvv 3495  [wsbc 3772  ⦋csb 3883   ∖ cdif 3933   ∪ cun 3934   ⊆ wss 3936   class class class wbr 5059  dom cdm 5550   ∘ ccom 5554  Rel wrel 5555  Fun wfun 6344  ‘cfv 6350  t+ctcl 14339

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-rep 5183  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-fal 1546  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3497  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4562  df-pr 4564  df-tp 4566  df-op 4568  df-uni 4833  df-int 4870  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-tr 5166  df-id 5455  df-eprel 5460  df-po 5469  df-so 5470  df-fr 5509  df-we 5511  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-pred 6143  df-ord 6189  df-on 6190  df-lim 6191  df-suc 6192  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-1st 7683  df-2nd 7684  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-er 8283  df-en 8504  df-dom 8505  df-sdom 8506  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-n0 11892  df-z 11976  df-uz 12238  df-fz 12887  df-seq 13364  df-trcl 14341  df-relexp 14374

This theorem is referenced by:  frege126d  40100