Description: A sufficient condition for a subclass relationship. (Contributed by Glauco Siliprandi, 3-Jan-2021)
Ref | Expression | ||
---|---|---|---|
Hypothesis | ssd.1 | |
|
Assertion | ssd | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssd.1 | |
|
2 | nfv | |
|
3 | 2 1 | ssdf | |