Theorem tfr1ALT 8038

Description: Alternate proof of tfr1 8035 using well-founded recursion. (Contributed by Scott Fenton, 3-Aug-2020.) (New usage is discouraged.) (Proof modification is discouraged.)

Hypothesis

Ref	Expression
tfrALT.1	⊢ 𝐹 = recs(𝐺)

Assertion

Ref	Expression
tfr1ALT	⊢ 𝐹 Fn On

Proof of Theorem tfr1ALT

Step	Hyp	Ref	Expression
1		epweon 7499	. 2 ⊢ E We On
2		epse 5540	. 2 ⊢ E Se On
3		tfrALT.1	. . 3 ⊢ 𝐹 = recs(𝐺)
4		df-recs 8010	. . 3 ⊢ recs(𝐺) = wrecs( E , On, 𝐺)
5	3, 4	eqtri 2846	. 2 ⊢ 𝐹 = wrecs( E , On, 𝐺)
6	1, 2, 5	wfr1 7975	1 ⊢ 𝐹 Fn On

Syntax hints:   = wceq 1537   E cep 5466  Oncon0 6193   Fn wfn 6352  wrecscwrecs 7948  recscrecs 8009

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-ral 3145  df-rex 3146  df-reu 3147  df-rmo 3148  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-se 5517  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-wrecs 7949  df-recs 8010

This theorem is referenced by: (None)