Theorem feq2i 5507

Description: Equality inference for functions. (Contributed by NM, 5-Sep-2011.)

Hypothesis

Ref	Expression
feq2i.1	|- A = B

Assertion

Ref	Expression
feq2i	|- ( F : A --> C <-> F : B --> C )

Proof of Theorem feq2i

Step	Hyp	Ref	Expression
1		feq2i.1	. 2 |- A = B
2		feq2 5497	. 2 |- ( A = B -> ( F : A --> C <-> F : B --> C ) )
3	1, 2	ax-mp 5	1 |- ( F : A --> C <-> F : B --> C )

Syntax hints:   <-> wb 105   = wceq 1398   -->wf 5353

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1496  ax-gen 1498  ax-4 1559  ax-17 1575  ax-ext 2216

This theorem depends on definitions:  df-bi 117  df-cleq 2227  df-fn 5360  df-f 5361

This theorem is referenced by:  fmpox  6409  fmpo  6410  tposf  6516  issmo  6532  tfrcllemsucfn  6597  1fv  10495  fxnn0nninf  10825  snopiswrd  11259  iswrddm0  11273  gfsum0  14104  0met  15375  dvef  15718  uhgr0e  16203  vtxdumgrfival  16419