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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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