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Mirrors > Home > NFE Home > Th. List > df-proj2 | Unicode version |
Description: Define the second projection operation. This operation recovers the second element of an ordered pair. Definition from [Rosser] p. 281. (Contributed by SF, 3-Feb-2015.) |
Ref | Expression |
---|---|
df-proj2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cA |
. . 3
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2 | 1 | cproj2 4565 |
. 2
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3 | vx |
. . . . . . 7
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4 | 3 | cv 1641 |
. . . . . 6
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5 | 4 | cphi 4563 |
. . . . 5
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6 | c0c 4375 |
. . . . . 6
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7 | 6 | csn 3738 |
. . . . 5
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8 | 5, 7 | cun 3208 |
. . . 4
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9 | 8, 1 | wcel 1710 |
. . 3
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10 | 9, 3 | cab 2339 |
. 2
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11 | 2, 10 | wceq 1642 |
1
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Colors of variables: wff setvar class |
This definition is referenced by: dfproj22 4578 proj2op 4602 opeq 4620 |
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