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Mirrors > Home > ILE Home > Th. List > df-8 | GIF version |
Description: Define the number 8. (Contributed by NM, 27-May-1999.) |
Ref | Expression |
---|---|
df-8 | ⊢ 8 = (7 + 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c8 8976 | . 2 class 8 | |
2 | c7 8975 | . . 3 class 7 | |
3 | c1 7812 | . . 3 class 1 | |
4 | caddc 7814 | . . 3 class + | |
5 | 2, 3, 4 | co 5875 | . 2 class (7 + 1) |
6 | 1, 5 | wceq 1353 | 1 wff 8 = (7 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 8re 9004 8pos 9022 8m1e7 9044 7p1e8 9058 4p4e8 9064 5p3e8 9066 6p2e8 9068 7p2e9 9070 8nn 9086 7lt8 9109 8p8e16 9469 9p8e17 9476 9p9e18 9477 8t8e64 9504 9t8e72 9511 |
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