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Mirrors > Home > MPE Home > Th. List > opex | Structured version Visualization version Unicode version |
Description: An ordered pair of classes is a set. Exercise 7 of [TakeutiZaring] p. 16. (Contributed by NM, 18-Aug-1993.) (Revised by Mario Carneiro, 26-Apr-2015.) |
Ref | Expression |
---|---|
opex |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfopif 4155 |
. 2
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2 | prex 4642 |
. . 3
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3 | 0ex 4528 |
. . 3
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4 | 2, 3 | ifex 3940 |
. 2
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5 | 1, 4 | eqeltri 2545 |
1
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