Theorem dffrege76 40278

Description: If from the two propositions that every result of an application of the procedure 𝑅 to 𝐵 has property 𝑓 and that property 𝑓 is hereditary in the 𝑅-sequence, it can be inferred, whatever 𝑓 may be, that 𝐸 has property 𝑓, then we say 𝐸 follows 𝐵 in the 𝑅-sequence. Definition 76 of [Frege1879] p. 60.

Each of 𝐵, 𝐸 and 𝑅 must be sets. (Contributed by RP, 2-Jul-2020.)

Hypotheses

Ref	Expression
frege76.b	⊢ 𝐵 ∈ 𝑈
frege76.e	⊢ 𝐸 ∈ 𝑉
frege76.r	⊢ 𝑅 ∈ 𝑊

Assertion

Ref	Expression
dffrege76	⊢ (∀𝑓(𝑅 hereditary 𝑓 → (∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓) → 𝐸 ∈ 𝑓)) ↔ 𝐵(t+‘𝑅)𝐸)

Distinct variable groups:   𝑓,𝑎,𝐵   𝑓,𝐸   𝑅,𝑎,𝑓   𝑈,𝑓   𝑓,𝑉   𝑓,𝑊

Allowed substitution hints:   𝑈(𝑎)   𝐸(𝑎)   𝑉(𝑎)   𝑊(𝑎)

Proof of Theorem dffrege76

Step	Hyp	Ref	Expression
1		frege76.b	. . 3 ⊢ 𝐵 ∈ 𝑈
2		frege76.e	. . 3 ⊢ 𝐸 ∈ 𝑉
3		frege76.r	. . 3 ⊢ 𝑅 ∈ 𝑊
4		brtrclfv2 40065	. . 3 ⊢ ((𝐵 ∈ 𝑈 ∧ 𝐸 ∈ 𝑉 ∧ 𝑅 ∈ 𝑊) → (𝐵(t+‘𝑅)𝐸 ↔ 𝐸 ∈ ∩ {𝑓 ∣ (𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓}))
5	1, 2, 3, 4	mp3an 1457	. 2 ⊢ (𝐵(t+‘𝑅)𝐸 ↔ 𝐸 ∈ ∩ {𝑓 ∣ (𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓})
6	2	elexi 3513	. . 3 ⊢ 𝐸 ∈ V
7	6	elintab 4879	. 2 ⊢ (𝐸 ∈ ∩ {𝑓 ∣ (𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓} ↔ ∀𝑓((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 → 𝐸 ∈ 𝑓))
8		imaundi 6002	. . . . . . . . 9 ⊢ (𝑅 “ ({𝐵} ∪ 𝑓)) = ((𝑅 “ {𝐵}) ∪ (𝑅 “ 𝑓))
9	8	equncomi 4130	. . . . . . . 8 ⊢ (𝑅 “ ({𝐵} ∪ 𝑓)) = ((𝑅 “ 𝑓) ∪ (𝑅 “ {𝐵}))
10	9	sseq1i 3994	. . . . . . 7 ⊢ ((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 ↔ ((𝑅 “ 𝑓) ∪ (𝑅 “ {𝐵})) ⊆ 𝑓)
11		unss 4159	. . . . . . 7 ⊢ (((𝑅 “ 𝑓) ⊆ 𝑓 ∧ (𝑅 “ {𝐵}) ⊆ 𝑓) ↔ ((𝑅 “ 𝑓) ∪ (𝑅 “ {𝐵})) ⊆ 𝑓)
12	10, 11	bitr4i 280	. . . . . 6 ⊢ ((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 ↔ ((𝑅 “ 𝑓) ⊆ 𝑓 ∧ (𝑅 “ {𝐵}) ⊆ 𝑓))
13		df-he 40112	. . . . . . . 8 ⊢ (𝑅 hereditary 𝑓 ↔ (𝑅 “ 𝑓) ⊆ 𝑓)
14	13	bicomi 226	. . . . . . 7 ⊢ ((𝑅 “ 𝑓) ⊆ 𝑓 ↔ 𝑅 hereditary 𝑓)
15		dfss2 3954	. . . . . . . 8 ⊢ ((𝑅 “ {𝐵}) ⊆ 𝑓 ↔ ∀𝑎(𝑎 ∈ (𝑅 “ {𝐵}) → 𝑎 ∈ 𝑓))
16	1	elexi 3513	. . . . . . . . . . . 12 ⊢ 𝐵 ∈ V
17		vex 3497	. . . . . . . . . . . 12 ⊢ 𝑎 ∈ V
18	16, 17	elimasn 5948	. . . . . . . . . . 11 ⊢ (𝑎 ∈ (𝑅 “ {𝐵}) ↔ ⟨𝐵, 𝑎⟩ ∈ 𝑅)
19		df-br 5059	. . . . . . . . . . 11 ⊢ (𝐵𝑅𝑎 ↔ ⟨𝐵, 𝑎⟩ ∈ 𝑅)
20	18, 19	bitr4i 280	. . . . . . . . . 10 ⊢ (𝑎 ∈ (𝑅 “ {𝐵}) ↔ 𝐵𝑅𝑎)
21	20	imbi1i 352	. . . . . . . . 9 ⊢ ((𝑎 ∈ (𝑅 “ {𝐵}) → 𝑎 ∈ 𝑓) ↔ (𝐵𝑅𝑎 → 𝑎 ∈ 𝑓))
22	21	albii 1816	. . . . . . . 8 ⊢ (∀𝑎(𝑎 ∈ (𝑅 “ {𝐵}) → 𝑎 ∈ 𝑓) ↔ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓))
23	15, 22	bitri 277	. . . . . . 7 ⊢ ((𝑅 “ {𝐵}) ⊆ 𝑓 ↔ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓))
24	14, 23	anbi12i 628	. . . . . 6 ⊢ (((𝑅 “ 𝑓) ⊆ 𝑓 ∧ (𝑅 “ {𝐵}) ⊆ 𝑓) ↔ (𝑅 hereditary 𝑓 ∧ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓)))
25	12, 24	bitri 277	. . . . 5 ⊢ ((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 ↔ (𝑅 hereditary 𝑓 ∧ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓)))
26	25	imbi1i 352	. . . 4 ⊢ (((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 → 𝐸 ∈ 𝑓) ↔ ((𝑅 hereditary 𝑓 ∧ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓)) → 𝐸 ∈ 𝑓))
27		impexp 453	. . . 4 ⊢ (((𝑅 hereditary 𝑓 ∧ ∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓)) → 𝐸 ∈ 𝑓) ↔ (𝑅 hereditary 𝑓 → (∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓) → 𝐸 ∈ 𝑓)))
28	26, 27	bitri 277	. . 3 ⊢ (((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 → 𝐸 ∈ 𝑓) ↔ (𝑅 hereditary 𝑓 → (∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓) → 𝐸 ∈ 𝑓)))
29	28	albii 1816	. 2 ⊢ (∀𝑓((𝑅 “ ({𝐵} ∪ 𝑓)) ⊆ 𝑓 → 𝐸 ∈ 𝑓) ↔ ∀𝑓(𝑅 hereditary 𝑓 → (∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓) → 𝐸 ∈ 𝑓)))
30	5, 7, 29	3bitrri 300	1 ⊢ (∀𝑓(𝑅 hereditary 𝑓 → (∀𝑎(𝐵𝑅𝑎 → 𝑎 ∈ 𝑓) → 𝐸 ∈ 𝑓)) ↔ 𝐵(t+‘𝑅)𝐸)

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398  ∀wal 1531   ∈ wcel 2110  {cab 2799   ∪ cun 3933   ⊆ wss 3935  {csn 4560  ⟨cop 4566  ∩ cint 4868   class class class wbr 5058   “ cima 5552  ‘cfv 6349  t+ctcl 14339   hereditary whe 40111

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5182  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455  ax-cnex 10587  ax-resscn 10588  ax-1cn 10589  ax-icn 10590  ax-addcl 10591  ax-addrcl 10592  ax-mulcl 10593  ax-mulrcl 10594  ax-mulcom 10595  ax-addass 10596  ax-mulass 10597  ax-distr 10598  ax-i2m1 10599  ax-1ne0 10600  ax-1rid 10601  ax-rnegex 10602  ax-rrecex 10603  ax-cnre 10604  ax-pre-lttri 10605  ax-pre-lttrn 10606  ax-pre-ltadd 10607  ax-pre-mulgt0 10608

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1536  df-fal 1546  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-nel 3124  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-pss 3953  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-tp 4565  df-op 4567  df-uni 4832  df-int 4869  df-iun 4913  df-br 5059  df-opab 5121  df-mpt 5139  df-tr 5165  df-id 5454  df-eprel 5459  df-po 5468  df-so 5469  df-fr 5508  df-we 5510  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-pred 6142  df-ord 6188  df-on 6189  df-lim 6190  df-suc 6191  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-riota 7108  df-ov 7153  df-oprab 7154  df-mpo 7155  df-om 7575  df-2nd 7684  df-wrecs 7941  df-recs 8002  df-rdg 8040  df-er 8283  df-en 8504  df-dom 8505  df-sdom 8506  df-pnf 10671  df-mnf 10672  df-xr 10673  df-ltxr 10674  df-le 10675  df-sub 10866  df-neg 10867  df-nn 11633  df-2 11694  df-n0 11892  df-z 11976  df-uz 12238  df-seq 13364  df-trcl 14341  df-relexp 14374  df-he 40112

This theorem is referenced by:  frege77  40279  frege89  40291