Theorem feq23d 5226

Description: Equality deduction for functions. (Contributed by NM, 8-Jun-2013.)

Hypotheses

Ref	Expression
feq23d.1	⊢ (𝜑 → 𝐴 = 𝐶)
feq23d.2	⊢ (𝜑 → 𝐵 = 𝐷)

Assertion

Ref	Expression
feq23d	⊢ (𝜑 → (𝐹:𝐴⟶𝐵 ↔ 𝐹:𝐶⟶𝐷))

Proof of Theorem feq23d

Step	Hyp	Ref	Expression
1		eqidd 2116	. 2 ⊢ (𝜑 → 𝐹 = 𝐹)
2		feq23d.1	. 2 ⊢ (𝜑 → 𝐴 = 𝐶)
3		feq23d.2	. 2 ⊢ (𝜑 → 𝐵 = 𝐷)
4	1, 2, 3	feq123d 5221	1 ⊢ (𝜑 → (𝐹:𝐴⟶𝐵 ↔ 𝐹:𝐶⟶𝐷))

Syntax hints:   → wi 4   ↔ wb 104   = wceq 1314  ⟶wf 5077

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 681  ax-5 1406  ax-7 1407  ax-gen 1408  ax-ie1 1452  ax-ie2 1453  ax-8 1465  ax-10 1466  ax-11 1467  ax-i12 1468  ax-bndl 1469  ax-4 1470  ax-17 1489  ax-i9 1493  ax-ial 1497  ax-i5r 1498  ax-ext 2097

This theorem depends on definitions:  df-bi 116  df-3an 947  df-tru 1317  df-nf 1420  df-sb 1719  df-clab 2102  df-cleq 2108  df-clel 2111  df-nfc 2244  df-v 2659  df-un 3041  df-in 3043  df-ss 3050  df-sn 3499  df-pr 3500  df-op 3502  df-br 3896  df-opab 3950  df-rel 4506  df-cnv 4507  df-co 4508  df-dm 4509  df-rn 4510  df-fun 5083  df-fn 5084  df-f 5085

This theorem is referenced by: (None)