Description: Technical lemma for bnj69 . This lemma may no longer be used or have become an indirect lemma of the theorem in question (i.e. a lemma of a lemma... of the theorem). (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypothesis | bnj1071.7 | |- D = ( _om \ { (/) } ) |
|
| Assertion | bnj1071 | |- ( n e. D -> _E Fr n ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | bnj1071.7 | |- D = ( _om \ { (/) } ) |
|
| 2 | 1 | bnj923 | |- ( n e. D -> n e. _om ) |
| 3 | nnord | |- ( n e. _om -> Ord n ) |
|
| 4 | ordfr | |- ( Ord n -> _E Fr n ) |
|
| 5 | 2 3 4 | 3syl | |- ( n e. D -> _E Fr n ) |