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Mirrors > Home > ILE Home > Th. List > df-4o | Unicode version |
Description: Define the ordinal number 4. (Contributed by Mario Carneiro, 14-Jul-2013.) |
Ref | Expression |
---|---|
df-4o |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c4o 6412 |
. 2
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2 | c3o 6411 |
. . 3
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3 | 2 | csuc 4365 |
. 2
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4 | 1, 3 | wceq 1353 |
1
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Colors of variables: wff set class |
This definition is referenced by: 4on 6428 4onn 6523 hash4 10789 |
Copyright terms: Public domain | W3C validator |