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Theorem frege124d 40315
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 40542. (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 2830 . . . . . . . . . . 11 (𝜑 → (𝐹𝑋) = 𝐴)
5 frege124d.x . . . . . . . . . . . 12 (𝜑𝑋 ∈ dom 𝐹)
6 funbrfvb 6708 . . . . . . . . . . . 12 ((Fun 𝐹𝑋 ∈ dom 𝐹) → ((𝐹𝑋) = 𝐴𝑋𝐹𝐴))
72, 5, 6syl2anc 587 . . . . . . . . . . 11 (𝜑 → ((𝐹𝑋) = 𝐴𝑋𝐹𝐴))
84, 7mpbid 235 . . . . . . . . . 10 (𝜑𝑋𝐹𝐴)
9 funeu 6368 . . . . . . . . . 10 ((Fun 𝐹𝑋𝐹𝐴) → ∃!𝑎 𝑋𝐹𝑎)
102, 8, 9syl2anc 587 . . . . . . . . 9 (𝜑 → ∃!𝑎 𝑋𝐹𝑎)
11 fvex 6671 . . . . . . . . . . . . 13 (𝐹𝑋) ∈ V
121, 11eqeltrdi 2924 . . . . . . . . . . . 12 (𝜑𝐴 ∈ V)
13 sbcan 3806 . . . . . . . . . . . . 13 ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) ↔ ([𝐴 / 𝑎]𝑋𝐹𝑎[𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵))
14 sbcbr2g 5110 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎𝑋𝐹𝐴 / 𝑎𝑎))
15 csbvarg 4365 . . . . . . . . . . . . . . . 16 (𝐴 ∈ V → 𝐴 / 𝑎𝑎 = 𝐴)
1615breq2d 5064 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → (𝑋𝐹𝐴 / 𝑎𝑎𝑋𝐹𝐴))
1714, 16bitrd 282 . . . . . . . . . . . . . 14 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑋𝐹𝑎𝑋𝐹𝐴))
18 sbcng 3804 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵))
19 sbcbr1g 5109 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵𝐴 / 𝑎𝑎(t+‘𝐹)𝐵))
2015breq1d 5062 . . . . . . . . . . . . . . . . 17 (𝐴 ∈ V → (𝐴 / 𝑎𝑎(t+‘𝐹)𝐵𝐴(t+‘𝐹)𝐵))
2119, 20bitrd 282 . . . . . . . . . . . . . . . 16 (𝐴 ∈ V → ([𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵𝐴(t+‘𝐹)𝐵))
2221notbid 321 . . . . . . . . . . . . . . 15 (𝐴 ∈ V → (¬ [𝐴 / 𝑎]𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
2318, 22bitrd 282 . . . . . . . . . . . . . 14 (𝐴 ∈ V → ([𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵 ↔ ¬ 𝐴(t+‘𝐹)𝐵))
2417, 23anbi12d 633 . . . . . . . . . . . . 13 (𝐴 ∈ V → (([𝐴 / 𝑎]𝑋𝐹𝑎[𝐴 / 𝑎] ¬ 𝑎(t+‘𝐹)𝐵) ↔ (𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵)))
2513, 24syl5bb 286 . . . . . . . . . . . 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 3849 . . . . . . . . . . 11 ([𝐴 / 𝑎](𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵))
2826, 27syl6bir 257 . . . . . . . . . 10 (𝜑 → ((𝑋𝐹𝐴 ∧ ¬ 𝐴(t+‘𝐹)𝐵) → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
298, 28mpand 694 . . . . . . . . 9 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)))
30 eupicka 2722 . . . . . . . . 9 ((∃!𝑎 𝑋𝐹𝑎 ∧ ∃𝑎(𝑋𝐹𝑎 ∧ ¬ 𝑎(t+‘𝐹)𝐵)) → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵))
3110, 29, 30syl6an 683 . . . . . . . 8 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵)))
32 frege124d.f . . . . . . . . . . . . 13 (𝜑𝐹 ∈ V)
33 funrel 6360 . . . . . . . . . . . . . 14 (Fun 𝐹 → Rel 𝐹)
342, 33syl 17 . . . . . . . . . . . . 13 (𝜑 → Rel 𝐹)
35 reltrclfv 14373 . . . . . . . . . . . . 13 ((𝐹 ∈ V ∧ Rel 𝐹) → Rel (t+‘𝐹))
3632, 34, 35syl2anc 587 . . . . . . . . . . . 12 (𝜑 → Rel (t+‘𝐹))
37 brrelex2 5593 . . . . . . . . . . . 12 ((Rel (t+‘𝐹) ∧ 𝑋(t+‘𝐹)𝐵) → 𝐵 ∈ V)
3836, 3, 37syl2anc 587 . . . . . . . . . . 11 (𝜑𝐵 ∈ V)
39 brcog 5724 . . . . . . . . . . 11 ((𝑋 ∈ dom 𝐹𝐵 ∈ V) → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
405, 38, 39syl2anc 587 . . . . . . . . . 10 (𝜑 → (𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
4140notbid 321 . . . . . . . . 9 (𝜑 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵 ↔ ¬ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵)))
42 alinexa 1844 . . . . . . . . 9 (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ ∃𝑎(𝑋𝐹𝑎𝑎(t+‘𝐹)𝐵))
4341, 42syl6rbbr 293 . . . . . . . 8 (𝜑 → (∀𝑎(𝑋𝐹𝑎 → ¬ 𝑎(t+‘𝐹)𝐵) ↔ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
4431, 43sylibd 242 . . . . . . 7 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
45 brdif 5105 . . . . . . . 8 (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵 ↔ (𝑋(t+‘𝐹)𝐵 ∧ ¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵))
4645simplbi2 504 . . . . . . 7 (𝑋(t+‘𝐹)𝐵 → (¬ 𝑋((t+‘𝐹) ∘ 𝐹)𝐵𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
473, 44, 46sylsyld 61 . . . . . 6 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵))
48 trclfvdecomr 40282 . . . . . . . . . . 11 (𝐹 ∈ V → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
4932, 48syl 17 . . . . . . . . . 10 (𝜑 → (t+‘𝐹) = (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)))
50 uncom 4114 . . . . . . . . . 10 (𝐹 ∪ ((t+‘𝐹) ∘ 𝐹)) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹)
5149, 50syl6eq 2875 . . . . . . . . 9 (𝜑 → (t+‘𝐹) = (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹))
52 eqimss 4008 . . . . . . . . 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 4415 . . . . . . . 8 ((t+‘𝐹) ⊆ (((t+‘𝐹) ∘ 𝐹) ∪ 𝐹) ↔ ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
5553, 54sylib 221 . . . . . . 7 (𝜑 → ((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹)) ⊆ 𝐹)
5655ssbrd 5095 . . . . . 6 (𝜑 → (𝑋((t+‘𝐹) ∖ ((t+‘𝐹) ∘ 𝐹))𝐵𝑋𝐹𝐵))
5747, 56syld 47 . . . . 5 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝑋𝐹𝐵))
58 funbrfv 6704 . . . . 5 (Fun 𝐹 → (𝑋𝐹𝐵 → (𝐹𝑋) = 𝐵))
592, 57, 58sylsyld 61 . . . 4 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵 → (𝐹𝑋) = 𝐵))
60 eqcom 2831 . . . 4 ((𝐹𝑋) = 𝐵𝐵 = (𝐹𝑋))
6159, 60syl6ib 254 . . 3 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝐵 = (𝐹𝑋)))
62 eqtr3 2846 . . 3 ((𝐴 = (𝐹𝑋) ∧ 𝐵 = (𝐹𝑋)) → 𝐴 = 𝐵)
631, 61, 62syl6an 683 . 2 (𝜑 → (¬ 𝐴(t+‘𝐹)𝐵𝐴 = 𝐵))
6463orrd 860 1 (𝜑 → (𝐴(t+‘𝐹)𝐵𝐴 = 𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 209  wa 399  wo 844  wal 1536   = wceq 1538  wex 1781  wcel 2115  ∃!weu 2654  Vcvv 3480  [wsbc 3758  csb 3866  cdif 3916  cun 3917  wss 3919   class class class wbr 5052  dom cdm 5542  ccom 5546  Rel wrel 5547  Fun wfun 6337  cfv 6343  t+ctcl 14341
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-rep 5176  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7451  ax-cnex 10585  ax-resscn 10586  ax-1cn 10587  ax-icn 10588  ax-addcl 10589  ax-addrcl 10590  ax-mulcl 10591  ax-mulrcl 10592  ax-mulcom 10593  ax-addass 10594  ax-mulass 10595  ax-distr 10596  ax-i2m1 10597  ax-1ne0 10598  ax-1rid 10599  ax-rnegex 10600  ax-rrecex 10601  ax-cnre 10602  ax-pre-lttri 10603  ax-pre-lttrn 10604  ax-pre-ltadd 10605  ax-pre-mulgt0 10606
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ne 3015  df-nel 3119  df-ral 3138  df-rex 3139  df-reu 3140  df-rab 3142  df-v 3482  df-sbc 3759  df-csb 3867  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-pss 3938  df-nul 4276  df-if 4450  df-pw 4523  df-sn 4550  df-pr 4552  df-tp 4554  df-op 4556  df-uni 4825  df-int 4863  df-iun 4907  df-br 5053  df-opab 5115  df-mpt 5133  df-tr 5159  df-id 5447  df-eprel 5452  df-po 5461  df-so 5462  df-fr 5501  df-we 5503  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-rn 5553  df-res 5554  df-ima 5555  df-pred 6135  df-ord 6181  df-on 6182  df-lim 6183  df-suc 6184  df-iota 6302  df-fun 6345  df-fn 6346  df-f 6347  df-f1 6348  df-fo 6349  df-f1o 6350  df-fv 6351  df-riota 7103  df-ov 7148  df-oprab 7149  df-mpo 7150  df-om 7571  df-1st 7679  df-2nd 7680  df-wrecs 7937  df-recs 7998  df-rdg 8036  df-er 8279  df-en 8500  df-dom 8501  df-sdom 8502  df-pnf 10669  df-mnf 10670  df-xr 10671  df-ltxr 10672  df-le 10673  df-sub 10864  df-neg 10865  df-nn 11631  df-2 11693  df-n0 11891  df-z 11975  df-uz 12237  df-fz 12891  df-seq 13370  df-trcl 14343  df-relexp 14376
This theorem is referenced by:  frege126d  40316
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