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Mirrors > Home > MPE Home > Th. List > sneq | Structured version Unicode version |
Description: Equality theorem for singletons. Part of Exercise 4 of [TakeutiZaring] p. 15. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
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sneq |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eqeq2 2466 |
. . 3
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2 | 1 | abbidv 2587 |
. 2
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3 | df-sn 3976 |
. 2
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4 | df-sn 3976 |
. 2
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5 | 2, 3, 4 | 3eqtr4g 2517 |
1
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