Theorem elfunsi 5832

Description: Membership in the set of all functions implies functionhood. (Contributed by Scott Fenton, 31-Jul-2019.)

Assertion

Ref	Expression
elfunsi	⊢ (F ∈ Funs → Fun F)

Proof of Theorem elfunsi

Step	Hyp	Ref	Expression
1		elfunsg 5831	. 2 ⊢ (F ∈ Funs → (F ∈ Funs ↔ Fun F))
2	1	ibi 232	1 ⊢ (F ∈ Funs → Fun F)

Syntax hints:   → wi 4   ∈ wcel 1710  Fun wfun 4776   Funs cfuns 5760

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-v 2862  df-nin 3212  df-compl 3213  df-in 3214  df-ss 3260  df-opab 4624  df-br 4641  df-co 4727  df-cnv 4786  df-fun 4790  df-funs 5761

This theorem is referenced by:  fnfrec  6321  frecsuc  6323