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| Mirrors > Home > MPE Home > Th. List > suceq | Structured version Visualization version Unicode version | ||
| Description: Equality of successors. (Contributed by NM, 30-Aug-1993.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) |
| Ref | Expression |
|---|---|
| suceq |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 22 |
. . 3
| |
| 2 | sneq 4187 |
. . 3
| |
| 3 | 1, 2 | uneq12d 3768 |
. 2
|
| 4 | df-suc 5729 |
. 2
| |
| 5 | df-suc 5729 |
. 2
| |
| 6 | 3, 4, 5 | 3eqtr4g 2681 |
1
|
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