Description: Selecting one of two alternatives within a restricted generalization if one of the alternatives is false. (Contributed by AV, 6-Sep-2018) (Proof shortened by AV, 13-Oct-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | ralralimp |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ornld | ||
2 | 1 | adantr | |
3 | 2 | ralimdv | |
4 | rspn0 | ||
5 | 4 | adantl | |
6 | 3 5 | syld |