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| Mirrors > Home > MPE Home > Th. List > syl5ss | Structured version Visualization version Unicode version | ||
| Description: Subclass transitivity deduction. (Contributed by NM, 6-Feb-2014.) |
| Ref | Expression |
|---|---|
| syl5ss.1 |
|
| syl5ss.2 |
|
| Ref | Expression |
|---|---|
| syl5ss |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | syl5ss.1 |
. . 3
| |
| 2 | 1 | a1i 11 |
. 2
|
| 3 | syl5ss.2 |
. 2
| |
| 4 | 2, 3 | sstrd 3613 |
1
|
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