Theorem isfld 14474

Description: A field is a commutative division ring. (Contributed by Mario Carneiro, 17-Jun-2015.)

Assertion

Ref	Expression
isfld	|- ( R e. Field <-> ( R e. DivRing /\ R e. CRing ) )

Proof of Theorem isfld

Step	Hyp	Ref	Expression
1		df-field 14465	. 2 |- Field = ( DivRing i^i CRing )
2	1	elin2 3409	1 |- ( R e. Field <-> ( R e. DivRing /\ R e. CRing ) )

Syntax hints:   /\ wa 104   <-> wb 105   e. wcel 2205   CRingccrg 14162   DivRingcdr 14462  Fieldcfield 14463

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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2216

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-v 2817  df-in 3219  df-field 14465

This theorem is referenced by:  flddrngd  14475  fldcrngd  14476