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Mirrors > Home > MPE Home > Th. List > tfr2ALT | Structured version Visualization version GIF version |
Description: Alternate proof of tfr2 8017 using well-founded recursion. (Contributed by Scott Fenton, 3-Aug-2020.) (New usage is discouraged.) (Proof modification is discouraged.) |
Ref | Expression |
---|---|
tfrALT.1 | ⊢ 𝐹 = recs(𝐺) |
Ref | Expression |
---|---|
tfr2ALT | ⊢ (𝐴 ∈ On → (𝐹‘𝐴) = (𝐺‘(𝐹 ↾ 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | epweon 7477 | . . 3 ⊢ E We On | |
2 | epse 5502 | . . 3 ⊢ E Se On | |
3 | tfrALT.1 | . . . 4 ⊢ 𝐹 = recs(𝐺) | |
4 | df-recs 7991 | . . . 4 ⊢ recs(𝐺) = wrecs( E , On, 𝐺) | |
5 | 3, 4 | eqtri 2821 | . . 3 ⊢ 𝐹 = wrecs( E , On, 𝐺) |
6 | 1, 2, 5 | wfr2 7957 | . 2 ⊢ (𝐴 ∈ On → (𝐹‘𝐴) = (𝐺‘(𝐹 ↾ Pred( E , On, 𝐴)))) |
7 | predon 7486 | . . . 4 ⊢ (𝐴 ∈ On → Pred( E , On, 𝐴) = 𝐴) | |
8 | 7 | reseq2d 5818 | . . 3 ⊢ (𝐴 ∈ On → (𝐹 ↾ Pred( E , On, 𝐴)) = (𝐹 ↾ 𝐴)) |
9 | 8 | fveq2d 6649 | . 2 ⊢ (𝐴 ∈ On → (𝐺‘(𝐹 ↾ Pred( E , On, 𝐴))) = (𝐺‘(𝐹 ↾ 𝐴))) |
10 | 6, 9 | eqtrd 2833 | 1 ⊢ (𝐴 ∈ On → (𝐹‘𝐴) = (𝐺‘(𝐹 ↾ 𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 E cep 5429 ↾ cres 5521 Predcpred 6115 Oncon0 6159 ‘cfv 6324 wrecscwrecs 7929 recscrecs 7990 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-rep 5154 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 ax-un 7441 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3or 1085 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-reu 3113 df-rmo 3114 df-rab 3115 df-v 3443 df-sbc 3721 df-csb 3829 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-pss 3900 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-tp 4530 df-op 4532 df-uni 4801 df-iun 4883 df-br 5031 df-opab 5093 df-mpt 5111 df-tr 5137 df-id 5425 df-eprel 5430 df-po 5438 df-so 5439 df-fr 5478 df-se 5479 df-we 5480 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-rn 5530 df-res 5531 df-ima 5532 df-pred 6116 df-ord 6162 df-on 6163 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-f1 6329 df-fo 6330 df-f1o 6331 df-fv 6332 df-wrecs 7930 df-recs 7991 |
This theorem is referenced by: (None) |
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