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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 7957 |
. 2
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2 | cn 7695 |
. . 3
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3 | cc0 6711 |
. . . 4
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4 | 3 | csn 3367 |
. . 3
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5 | 2, 4 | cun 2909 |
. 2
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6 | 1, 5 | wceq 1242 |
1
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Colors of variables: wff set class |
This definition is referenced by: elnn0 7959 nnssnn0 7960 nn0ssre 7961 nn0ex 7963 dfn2 7970 nn0addcl 7993 nn0mulcl 7994 nn0ssz 8039 |
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