Theorem 3anbi123d 1291

Description: Deduction joining 3 equivalences to form equivalence of conjunctions. (Contributed by NM, 22-Apr-1994.)

Hypotheses

Ref	Expression
bi3d.1	⊢ (𝜑 → (𝜓 ↔ 𝜒))
bi3d.2	⊢ (𝜑 → (𝜃 ↔ 𝜏))
bi3d.3	⊢ (𝜑 → (𝜂 ↔ 𝜁))

Assertion

Ref	Expression
3anbi123d	⊢ (𝜑 → ((𝜓 ∧ 𝜃 ∧ 𝜂) ↔ (𝜒 ∧ 𝜏 ∧ 𝜁)))

Proof of Theorem 3anbi123d

Step	Hyp	Ref	Expression
1		bi3d.1	. . . 4 ⊢ (𝜑 → (𝜓 ↔ 𝜒))
2		bi3d.2	. . . 4 ⊢ (𝜑 → (𝜃 ↔ 𝜏))
3	1, 2	anbi12d 465	. . 3 ⊢ (𝜑 → ((𝜓 ∧ 𝜃) ↔ (𝜒 ∧ 𝜏)))
4		bi3d.3	. . 3 ⊢ (𝜑 → (𝜂 ↔ 𝜁))
5	3, 4	anbi12d 465	. 2 ⊢ (𝜑 → (((𝜓 ∧ 𝜃) ∧ 𝜂) ↔ ((𝜒 ∧ 𝜏) ∧ 𝜁)))
6		df-3an 965	. 2 ⊢ ((𝜓 ∧ 𝜃 ∧ 𝜂) ↔ ((𝜓 ∧ 𝜃) ∧ 𝜂))
7		df-3an 965	. 2 ⊢ ((𝜒 ∧ 𝜏 ∧ 𝜁) ↔ ((𝜒 ∧ 𝜏) ∧ 𝜁))
8	5, 6, 7	3bitr4g 222	1 ⊢ (𝜑 → ((𝜓 ∧ 𝜃 ∧ 𝜂) ↔ (𝜒 ∧ 𝜏 ∧ 𝜁)))

Syntax hints:   → wi 4   ∧ wa 103   ↔ wb 104   ∧ w3a 963

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107

This theorem depends on definitions:  df-bi 116  df-3an 965

This theorem is referenced by:  3anbi12d  1292  3anbi13d  1293  3anbi23d  1294  limeq  4307  smoeq  6195  tfrlemi1  6237  tfr1onlemaccex  6253  tfrcllemaccex  6266  ereq1  6444  updjud  6975  ctssdclemr  7005  elinp  7306  sup3exmid  8739  iccshftr  9807  iccshftl  9809  iccdil  9811  icccntr  9813  fzaddel  9870  elfzomelpfzo  10039  seq3f1olemstep  10305  seq3f1olemp  10306  sumeq1  11156  summodclem2  11183  summodc  11184  zsumdc  11185  prodmodclem2  11378  prodmodc  11379  divalglemnn  11651  divalglemeunn  11654  divalglemeuneg  11656  dfgcd2  11738  ctiunct  11989  isstruct2im  12008  isstruct2r  12009  fiinopn  12210  lmfval  12400  upxp  12480  2irrexpqap  13103  dceqnconst  13423