Description: A subclass transitivity deduction. (Contributed by NM, 27-Sep-2004)
Ref | Expression | ||
---|---|---|---|
Hypotheses | sylan9ssr.1 | |
|
sylan9ssr.2 | |
||
Assertion | sylan9ssr | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sylan9ssr.1 | |
|
2 | sylan9ssr.2 | |
|
3 | 1 2 | sylan9ss | |
4 | 3 | ancoms | |