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Mirrors > Home > ILE Home > Th. List > df-xnn0 | Unicode version |
Description: Define the set of
extended nonnegative integers that includes positive
infinity. Analogue of the extension of the real numbers ![]() |
Ref | Expression |
---|---|
df-xnn0 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cxnn0 8646 |
. 2
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2 | cn0 8583 |
. . 3
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3 | cpnf 7440 |
. . . 4
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4 | 3 | csn 3425 |
. . 3
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5 | 2, 4 | cun 2984 |
. 2
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6 | 1, 5 | wceq 1287 |
1
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Colors of variables: wff set class |
This definition is referenced by: elxnn0 8648 nn0ssxnn0 8649 fxnn0nninf 9747 |
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