Theorem funeqd 4943

Description: Equality deduction for the function predicate. (Contributed by NM, 23-Feb-2013.)

Hypothesis

Ref	Expression
funeqd.1	⊢ (𝜑 → 𝐴 = 𝐵)

Assertion

Ref	Expression
funeqd	⊢ (𝜑 → (Fun 𝐴 ↔ Fun 𝐵))

Proof of Theorem funeqd

Step	Hyp	Ref	Expression
1		funeqd.1	. 2 ⊢ (𝜑 → 𝐴 = 𝐵)
2		funeq 4941	. 2 ⊢ (𝐴 = 𝐵 → (Fun 𝐴 ↔ Fun 𝐵))
3	1, 2	syl 14	1 ⊢ (𝜑 → (Fun 𝐴 ↔ Fun 𝐵))

Syntax hints:   → wi 4   ↔ wb 103   = wceq 1284  Fun wfun 4916

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-in 2979  df-ss 2986  df-br 3786  df-opab 3840  df-rel 4370  df-cnv 4371  df-co 4372  df-fun 4924

This theorem is referenced by:  funopg  4954  funsng  4966  funcnvuni  4988  f1eq1  5107  shftfn  9712