Description: A nested syllogism inference with different antecedents. (Contributed by NM, 13-May-1993) (Proof shortened by Josh Purinton, 29-Dec-2000)
Ref | Expression | ||
---|---|---|---|
Hypotheses | syl9.1 | |
|
syl9.2 | |
||
Assertion | syl9 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | syl9.1 | |
|
2 | syl9.2 | |
|
3 | 2 | a1i | |
4 | 1 3 | syl5d | |