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Mirrors > Home > MPE Home > Th. List > unieq | Structured version Visualization version Unicode version |
Description: Equality theorem for class union. Exercise 15 of [TakeutiZaring] p. 18. (Contributed by NM, 10-Aug-1993.) (Proof shortened by Andrew Salmon, 29-Jun-2011.) |
Ref | Expression |
---|---|
unieq |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexeq 2988 |
. . 3
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2 | 1 | abbidv 2569 |
. 2
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3 | dfuni2 4200 |
. 2
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4 | dfuni2 4200 |
. 2
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5 | 2, 3, 4 | 3eqtr4g 2510 |
1
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