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Theorem frege124d 36870
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 37099. (Contributed by RP, 16-Jul-2020.)
Hypotheses
Ref Expression
frege124d.f (𝜑𝐹 ∈ V)
frege124d.x (𝜑𝑋 ∈ dom 𝐹)
frege124d.a (𝜑𝐴 = (𝐹𝑋))
frege124d.xb (𝜑𝑋(t+‘𝐹)𝐵)
frege124d.fun (𝜑 → Fun 𝐹)
Assertion
Ref Expression
frege124d (𝜑 → (𝐴(t+‘𝐹)𝐵𝐴 = 𝐵))

Proof of Theorem frege124d
Dummy variable 𝑎 is distinct from all other variables.
StepHypRef Expression
1 frege124d.a . . 3 (𝜑𝐴 = (𝐹𝑋))
2 frege124d.fun . . . . 5 (𝜑 → Fun 𝐹)
3 frege124d.xb . . . . . . 7 (𝜑𝑋(t+‘𝐹)𝐵)
41eqcomd 2610 . . . . . . . . . . 11 (𝜑 → (𝐹𝑋) = 𝐴)
5 frege124d.x . . . . . . . . . . . 12 (𝜑𝑋 ∈ dom 𝐹)
6 funbrfvb 6128 . . . . . . . . . . . 12 ((Fun 𝐹𝑋 ∈ dom 𝐹) → ((𝐹𝑋) = 𝐴𝑋𝐹𝐴))
72, 5, 6syl2anc 690 . . . . . . . . . . 11 (𝜑 → ((𝐹𝑋) = 𝐴𝑋𝐹𝐴))
84, 7mpbid 220 . . . . . . . . . 10 (𝜑𝑋𝐹𝐴)
9 funeu 5809 . . . . . . . . . 10 ((Fun 𝐹𝑋𝐹𝐴) → ∃!𝑎 𝑋𝐹𝑎)
102, 8, 9syl2anc 690 . . . . . . . . 9 (𝜑 → ∃!𝑎 𝑋𝐹𝑎)
11 fvex 6093 . . . . . . . . . . . . 13 (𝐹𝑋) ∈ V
121, 11syl6eqel 2690 . . . . . . . . . . . 12 (𝜑𝐴 ∈ V)
13 sbcan 3439 . . . . . . . . . . . . 13 ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ ([𝐴 / 𝑎]𝑋𝐹𝑎[𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵))
14 sbcbr2g 4629 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎𝑋𝐹𝐴 / 𝑎𝑎))
15 csbvarg 3949 . . . . . . . . . . . . . . . 16 (𝐴 ∈ V → 𝐴 / 𝑎𝑎 = 𝐴)
1615breq2d 4584 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → (𝑋𝐹𝐴 / 𝑎𝑎𝑋𝐹𝐴))
1714, 16bitrd 266 . . . . . . . . . . . . . 14 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎𝑋𝐹𝐴))
18 sbcng 3437 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵))
19 sbcbr1g 4628 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵𝐴 / 𝑎𝑎(t+‘𝐹)𝐵))
2015breq1d 4582 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ V → (𝐴 / 𝑎𝑎(t+‘𝐹)𝐵𝐴(t+‘𝐹)𝐵))
2119, 20bitrd 266 . . . . . . . . . . . . . . . 16 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵𝐴(t+‘𝐹)𝐵))
2221notbid 306 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → (¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
2318, 22bitrd 266 . . . . . . . . . . . . . 14 (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
2417, 23anbi12d 742 . . . . . . . . . . . . 13 (𝐴 ∈ V → (([𝐴 / 𝑎]𝑋𝐹𝑎[𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
2513, 24syl5bb 270 . . . . . . . . . . . 12 (𝐴 ∈ V → ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
2612, 25syl 17 . . . . . . . . . . 11 (𝜑 → ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
27 spesbc 3481 . . . . . . . . . . 11 ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵))
2826, 27syl6bir 242 . . . . . . . . . 10 (𝜑 → ((𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
298, 28mpand 706 . . . . . . . . 9 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
30 eupicka 2519 . . . . . . . . 9 ((∃!𝑎 𝑋𝐹𝑎 ∧ ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)) → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵))
3110, 29, 30syl6an 565 . . . . . . . 8 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵)))
32 frege124d.f . . . . . . . . . . . . 13 (𝜑𝐹 ∈ V)
33 funrel 5802 . . . . . . . . . . . . . 14 (Fun 𝐹 → Rel 𝐹)
342, 33syl 17 . . . . . . . . . . . . 13 (𝜑 → Rel 𝐹)
35 reltrclfv 13547 . . . . . . . . . . . . 13 ((𝐹 ∈ V ∧ Rel 𝐹) → Rel (t+‘𝐹))
3632, 34, 35syl2anc 690 . . . . . . . . . . . 12 (𝜑 → Rel (t+‘𝐹))
37 brrelex2 5066 . . . . . . . . . . . 12 ((Rel (t+‘𝐹) ∧ 𝑋(t+‘𝐹)𝐵) → 𝐵 ∈ V)
3836, 3, 37syl2anc 690 . . . . . . . . . . 11 (𝜑𝐵 ∈ V)
39 brcog 5193 . . . . . . . . . . 11 ((𝑋 ∈ dom 𝐹𝐵 ∈ V) → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
405, 38, 39syl2anc 690 . . . . . . . . . 10 (𝜑 → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
4140notbid 306 . . . . . . . . 9 (𝜑 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ¬ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
42 alinexa 1757 . . . . . . . . 9 (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵))
4341, 42syl6rbbr 277 . . . . . . . 8 (𝜑 → (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
4431, 43sylibd 227 . . . . . . 7 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
45 brdif 4624 . . . . . . . 8 (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 ↔ (𝑋(t+‘𝐹)𝐵 ∧ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
4645simplbi2 652 . . . . . . 7 (𝑋(t+‘𝐹)𝐵 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
473, 44, 46sylsyld 58 . . . . . 6 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
48 trclfvdecomr 36837 . . . . . . . . . . 11 (𝐹 ∈ V → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
4932, 48syl 17 . . . . . . . . . 10 (𝜑 → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
50 uncom 3713 . . . . . . . . . 10 (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹)
5149, 50syl6eq 2654 . . . . . . . . 9 (𝜑 → (t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
52 eqimss 3614 . . . . . . . . 9 ((t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) → (t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
5351, 52syl 17 . . . . . . . 8 (𝜑 → (t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
54 ssundif 3998 . . . . . . . 8 ((t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) ↔ ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
5553, 54sylib 206 . . . . . . 7 (𝜑 → ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
5655ssbrd 4615 . . . . . 6 (𝜑 → (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵𝑋𝐹𝐵))
5747, 56syld 45 . . . . 5 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝑋𝐹𝐵))
58 funbrfv 6124 . . . . 5 (Fun 𝐹 → (𝑋𝐹𝐵 → (𝐹𝑋) = 𝐵))
592, 57, 58sylsyld 58 . . . 4 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → (𝐹𝑋) = 𝐵))
60 eqcom 2611 . . . 4 ((𝐹𝑋) = 𝐵𝐵 = (𝐹𝑋))
6159, 60syl6ib 239 . . 3 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝐵 = (𝐹𝑋)))
62 eqtr3 2625 . . 3 ((𝐴 = (𝐹𝑋) ∧ 𝐵 = (𝐹𝑋)) → 𝐴 = 𝐵)
631, 61, 62syl6an 565 . 2 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝐴 = 𝐵))
6463orrd 391 1 (𝜑 → (𝐴(t+‘𝐹)𝐵𝐴 = 𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 194  wo 381  wa 382  wal 1472   = wceq 1474  wex 1694  wcel 1975  ∃!weu 2452  Vcvv 3167  [wsbc 3396  csb 3493  cdif 3531  cun 3532  wss 3534   class class class wbr 4572  dom cdm 5023  ccom 5027  Rel wrel 5028  Fun wfun 5779  cfv 5785  t+ctcl 13513
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1711  ax-4 1726  ax-5 1825  ax-6 1873  ax-7 1920  ax-8 1977  ax-9 1984  ax-10 2004  ax-11 2019  ax-12 2031  ax-13 2227  ax-ext 2584  ax-rep 4688  ax-sep 4698  ax-nul 4707  ax-pow 4759  ax-pr 4823  ax-un 6819  ax-cnex 9843  ax-resscn 9844  ax-1cn 9845  ax-icn 9846  ax-addcl 9847  ax-addrcl 9848  ax-mulcl 9849  ax-mulrcl 9850  ax-mulcom 9851  ax-addass 9852  ax-mulass 9853  ax-distr 9854  ax-i2m1 9855  ax-1ne0 9856  ax-1rid 9857  ax-rnegex 9858  ax-rrecex 9859  ax-cnre 9860  ax-pre-lttri 9861  ax-pre-lttrn 9862  ax-pre-ltadd 9863  ax-pre-mulgt0 9864
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-fal 1480  df-ex 1695  df-nf 1700  df-sb 1866  df-eu 2456  df-mo 2457  df-clab 2591  df-cleq 2597  df-clel 2600  df-nfc 2734  df-ne 2776  df-nel 2777  df-ral 2895  df-rex 2896  df-reu 2897  df-rab 2899  df-v 3169  df-sbc 3397  df-csb 3494  df-dif 3537  df-un 3539  df-in 3541  df-ss 3548  df-pss 3550  df-nul 3869  df-if 4031  df-pw 4104  df-sn 4120  df-pr 4122  df-tp 4124  df-op 4126  df-uni 4362  df-int 4400  df-iun 4446  df-br 4573  df-opab 4633  df-mpt 4634  df-tr 4670  df-eprel 4934  df-id 4938  df-po 4944  df-so 4945  df-fr 4982  df-we 4984  df-xp 5029  df-rel 5030  df-cnv 5031  df-co 5032  df-dm 5033  df-rn 5034  df-res 5035  df-ima 5036  df-pred 5578  df-ord 5624  df-on 5625  df-lim 5626  df-suc 5627  df-iota 5749  df-fun 5787  df-fn 5788  df-f 5789  df-f1 5790  df-fo 5791  df-f1o 5792  df-fv 5793  df-riota 6484  df-ov 6525  df-oprab 6526  df-mpt2 6527  df-om 6930  df-1st 7031  df-2nd 7032  df-wrecs 7266  df-recs 7327  df-rdg 7365  df-er 7601  df-en 7814  df-dom 7815  df-sdom 7816  df-pnf 9927  df-mnf 9928  df-xr 9929  df-ltxr 9930  df-le 9931  df-sub 10114  df-neg 10115  df-nn 10863  df-2 10921  df-n0 11135  df-z 11206  df-uz 11515  df-fz 12148  df-seq 12614  df-trcl 13515  df-relexp 13550
This theorem is referenced by:  frege126d  36871
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