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Mirrors > Home > NFE Home > Th. List > df-3c | Unicode version |
Description: Define cardinal three. This is the set of all sets with three unique elements. (Contributed by Scott Fenton, 24-Feb-2015.) |
Ref | Expression |
---|---|
df-3c | 3c Nc |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c3c 6095 | . 2 3c | |
2 | c0 3550 | . . . 4 | |
3 | cvv 2859 | . . . 4 | |
4 | 2 | csn 3737 | . . . . 5 |
5 | 3, 4 | cdif 3206 | . . . 4 |
6 | 2, 3, 5 | ctp 3739 | . . 3 |
7 | 6 | cnc 6091 | . 2 Nc |
8 | 1, 7 | wceq 1642 | 1 3c Nc |
Colors of variables: wff setvar class |
This definition is referenced by: 2p1e3c 6156 |
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