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Mirrors > Home > ILE Home > Th. List > df-z | Unicode version |
Description: Define the set of integers, which are the positive and negative integers together with zero. Definition of integers in [Apostol] p. 22. The letter Z abbreviates the German word Zahlen meaning "numbers." (Contributed by NM, 8-Jan-2002.) |
Ref | Expression |
---|---|
df-z |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cz 9252 |
. 2
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2 | vn |
. . . . . 6
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3 | 2 | cv 1352 |
. . . . 5
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4 | cc0 7810 |
. . . . 5
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5 | 3, 4 | wceq 1353 |
. . . 4
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6 | cn 8918 |
. . . . 5
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7 | 3, 6 | wcel 2148 |
. . . 4
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8 | 3 | cneg 8128 |
. . . . 5
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9 | 8, 6 | wcel 2148 |
. . . 4
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10 | 5, 7, 9 | w3o 977 |
. . 3
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11 | cr 7809 |
. . 3
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12 | 10, 2, 11 | crab 2459 |
. 2
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13 | 1, 12 | wceq 1353 |
1
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Colors of variables: wff set class |
This definition is referenced by: elz 9254 |
Copyright terms: Public domain | W3C validator |