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Mirrors > Home > ILE Home > Th. List > opeq1 | Unicode version |
Description: Equality theorem for ordered pairs. (Contributed by NM, 25-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.) |
Ref | Expression |
---|---|
opeq1 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2203 |
. . . . . 6
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2 | 1 | anbi1d 461 |
. . . . 5
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3 | sneq 3543 |
. . . . . . 7
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4 | preq1 3608 |
. . . . . . 7
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5 | 3, 4 | preq12d 3616 |
. . . . . 6
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6 | 5 | eleq2d 2210 |
. . . . 5
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7 | 2, 6 | anbi12d 465 |
. . . 4
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8 | df-3an 965 |
. . . 4
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9 | df-3an 965 |
. . . 4
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10 | 7, 8, 9 | 3bitr4g 222 |
. . 3
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11 | 10 | abbidv 2258 |
. 2
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12 | df-op 3541 |
. 2
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13 | df-op 3541 |
. 2
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14 | 11, 12, 13 | 3eqtr4g 2198 |
1
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