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Mirrors > Home > ILE Home > Th. List > df-ni | Unicode version |
Description: Define the class of positive integers. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. (Contributed by NM, 15-Aug-1995.) |
Ref | Expression |
---|---|
df-ni |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cnpi 6370 |
. 2
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2 | com 4313 |
. . 3
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3 | c0 3224 |
. . . 4
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4 | 3 | csn 3375 |
. . 3
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5 | 2, 4 | cdif 2914 |
. 2
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6 | 1, 5 | wceq 1243 |
1
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Colors of variables: wff set class |
This definition is referenced by: elni 6406 pinn 6407 niex 6410 dmaddpi 6423 dmmulpi 6424 |
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