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| Description: An equality transitivity deduction. (The proof was shortened by Andrew Salmon, 25-May-2011.) |
| Ref | Expression |
|---|---|
| sylan9eq.1 |
|
| sylan9eq.2 |
|
| Ref | Expression |
|---|---|
| sylan9eq |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqtr 1904 |
. 2
| |
| 2 | sylan9eq.1 |
. 2
| |
| 3 | sylan9eq.2 |
. 2
| |
| 4 | 1, 2, 3 | syl2an 503 |
1
|