Theorem frege124d 37072

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 37301. (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 2616	. . . . . . . . . . 11 ⊢ (𝜑 → (𝐹‘𝑋) = 𝐴)
5		frege124d.x	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝑋 ∈ dom 𝐹)
6		funbrfvb 6148	. . . . . . . . . . . 12 ⊢ ((Fun 𝐹 ∧ 𝑋 ∈ dom 𝐹) → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
7	2, 5, 6	syl2anc 691	. . . . . . . . . . 11 ⊢ (𝜑 → ((𝐹‘𝑋) = 𝐴 ↔ 𝑋𝐹𝐴))
8	4, 7	mpbid 221	. . . . . . . . . 10 ⊢ (𝜑 → 𝑋𝐹𝐴)
9		funeu 5828	. . . . . . . . . 10 ⊢ ((Fun 𝐹 ∧ 𝑋𝐹𝐴) → ∃!𝑎 𝑋𝐹𝑎)
10	2, 8, 9	syl2anc 691	. . . . . . . . 9 ⊢ (𝜑 → ∃!𝑎 𝑋𝐹𝑎)
11		fvex 6113	. . . . . . . . . . . . 13 ⊢ (𝐹‘𝑋) ∈ V
12	1, 11	syl6eqel 2696	. . . . . . . . . . . 12 ⊢ (𝜑 → 𝐴 ∈ V)
13		sbcan 3445	. . . . . . . . . . . . 13 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ ([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵))
14		sbcbr2g 4640	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹⦋𝐴 / 𝑎⦌𝑎))
15		csbvarg 3955	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ⦋𝐴 / 𝑎⦌𝑎 = 𝐴)
16	15	breq2d 4595	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (𝑋𝐹⦋𝐴 / 𝑎⦌𝑎 ↔ 𝑋𝐹𝐴))
17	14, 16	bitrd 267	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎 ↔ 𝑋𝐹𝐴))
18		sbcng 3443	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵))
19		sbcbr1g 4639	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵))
20	15	breq1d 4593	. . . . . . . . . . . . . . . . 17 ⊢ (𝐴 ∈ V → (⦋𝐴 / 𝑎⦌𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
21	19, 20	bitrd 267	. . . . . . . . . . . . . . . 16 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ 𝐴(t+‘𝐹)𝐵))
22	21	notbid 307	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ V → (¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
23	18, 22	bitrd 267	. . . . . . . . . . . . . 14 ⊢ (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
24	17, 23	anbi12d 743	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ V → (([𝐴 / 𝑎]𝑋𝐹𝑎 ∧ [𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
25	13, 24	syl5bb 271	. . . . . . . . . . . 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 3487	. . . . . . . . . . 11 ⊢ ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵))
28	26, 27	syl6bir 243	. . . . . . . . . 10 ⊢ (𝜑 → ((𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
29	8, 28	mpand 707	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
30		eupicka 2525	. . . . . . . . 9 ⊢ ((∃!𝑎 𝑋𝐹𝑎 ∧ ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)) → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵))
31	10, 29, 30	syl6an 566	. . . . . . . 8 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵)))
32		frege124d.f	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐹 ∈ V)
33		funrel 5821	. . . . . . . . . . . . . 14 ⊢ (Fun 𝐹 → Rel 𝐹)
34	2, 33	syl 17	. . . . . . . . . . . . 13 ⊢ (𝜑 → Rel 𝐹)
35		reltrclfv 13606	. . . . . . . . . . . . 13 ⊢ ((𝐹 ∈ V ∧ Rel 𝐹) → Rel (t+‘𝐹))
36	32, 34, 35	syl2anc 691	. . . . . . . . . . . 12 ⊢ (𝜑 → Rel (t+‘𝐹))
37		brrelex2 5081	. . . . . . . . . . . 12 ⊢ ((Rel (t+‘𝐹) ∧ 𝑋(t+‘𝐹)𝐵) → 𝐵 ∈ V)
38	36, 3, 37	syl2anc 691	. . . . . . . . . . 11 ⊢ (𝜑 → 𝐵 ∈ V)
39		brcog 5210	. . . . . . . . . . 11 ⊢ ((𝑋 ∈ dom 𝐹 ∧ 𝐵 ∈ V) → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
40	5, 38, 39	syl2anc 691	. . . . . . . . . 10 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
41	40	notbid 307	. . . . . . . . 9 ⊢ (𝜑 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵)))
42		alinexa 1759	. . . . . . . . 9 ⊢ (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ ∃𝑎(𝑋𝐹𝑎 ∧ 𝑎(t+‘𝐹)𝐵))
43	41, 42	syl6rbbr 278	. . . . . . . 8 ⊢ (𝜑 → (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
44	31, 43	sylibd 228	. . . . . . 7 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
45		brdif 4635	. . . . . . . 8 ⊢ (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 ↔ (𝑋(t+‘𝐹)𝐵 ∧ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
46	45	simplbi2 653	. . . . . . 7 ⊢ (𝑋(t+‘𝐹)𝐵 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 → 𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
47	3, 44, 46	sylsyld 59	. . . . . 6 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
48		trclfvdecomr 37039	. . . . . . . . . . 11 ⊢ (𝐹 ∈ V → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
49	32, 48	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
50		uncom 3719	. . . . . . . . . 10 ⊢ (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹)
51	49, 50	syl6eq 2660	. . . . . . . . 9 ⊢ (𝜑 → (t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
52		eqimss 3620	. . . . . . . . 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 4004	. . . . . . . 8 ⊢ ((t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) ↔ ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
55	53, 54	sylib 207	. . . . . . 7 ⊢ (𝜑 → ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
56	55	ssbrd 4626	. . . . . 6 ⊢ (𝜑 → (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 → 𝑋𝐹𝐵))
57	47, 56	syld 46	. . . . 5 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝑋𝐹𝐵))
58		funbrfv 6144	. . . . 5 ⊢ (Fun 𝐹 → (𝑋𝐹𝐵 → (𝐹‘𝑋) = 𝐵))
59	2, 57, 58	sylsyld 59	. . . 4 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → (𝐹‘𝑋) = 𝐵))
60		eqcom 2617	. . . 4 ⊢ ((𝐹‘𝑋) = 𝐵 ↔ 𝐵 = (𝐹‘𝑋))
61	59, 60	syl6ib 240	. . 3 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐵 = (𝐹‘𝑋)))
62		eqtr3 2631	. . 3 ⊢ ((𝐴 = (𝐹‘𝑋) ∧ 𝐵 = (𝐹‘𝑋)) → 𝐴 = 𝐵)
63	1, 61, 62	syl6an 566	. 2 ⊢ (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → 𝐴 = 𝐵))
64	63	orrd 392	1 ⊢ (𝜑 → (𝐴(t+‘𝐹)𝐵 ∨ 𝐴 = 𝐵))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 195   ∨ wo 382   ∧ wa 383  ∀wal 1473   = wceq 1475  ∃wex 1695   ∈ wcel 1977  ∃!weu 2458  Vcvv 3173  [wsbc 3402  ⦋csb 3499   ∖ cdif 3537   ∪ cun 3538   ⊆ wss 3540   class class class wbr 4583  dom cdm 5038   ∘ ccom 5042  Rel wrel 5043  Fun wfun 5798  ‘cfv 5804  t+ctcl 13572

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-fal 1481  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-er 7629  df-en 7842  df-dom 7843  df-sdom 7844  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-seq 12664  df-trcl 13574  df-relexp 13609

This theorem is referenced by:  frege126d  37073