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Mirrors > Home > ILE Home > Th. List > df-n0 | Unicode version |
Description: Define the set of nonnegative integers. (Contributed by Raph Levien, 10-Dec-2002.) |
Ref | Expression |
---|---|
df-n0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cn0 8875 |
. 2
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2 | cn 8624 |
. . 3
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3 | cc0 7541 |
. . . 4
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4 | 3 | csn 3491 |
. . 3
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5 | 2, 4 | cun 3033 |
. 2
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6 | 1, 5 | wceq 1312 |
1
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Colors of variables: wff set class |
This definition is referenced by: elnn0 8877 nnssnn0 8878 nn0ssre 8879 nn0ex 8881 dfn2 8888 nn0addcl 8910 nn0mulcl 8911 nn0ssz 8970 |
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