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Mirrors > Home > ILE Home > Th. List > df-1o | Unicode version |
Description: Define the ordinal number 1. (Contributed by NM, 29-Oct-1995.) |
Ref | Expression |
---|---|
df-1o |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c1o 5994 |
. 2
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2 | c0 3224 |
. . 3
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3 | 2 | csuc 4102 |
. 2
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4 | 1, 3 | wceq 1243 |
1
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Colors of variables: wff set class |
This definition is referenced by: 1on 6008 df1o2 6013 ordgt0ge1 6018 oa1suc 6047 1onn 6093 nnm1 6097 nlt1pig 6439 indpi 6440 |
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