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Mirrors > Home > ILE Home > Th. List > df-7 | GIF version |
Description: Define the number 7. (Contributed by NM, 27-May-1999.) |
Ref | Expression |
---|---|
df-7 | ⊢ 7 = (6 + 1) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c7 8539 | . 2 class 7 | |
2 | c6 8538 | . . 3 class 6 | |
3 | c1 7412 | . . 3 class 1 | |
4 | caddc 7414 | . . 3 class + | |
5 | 2, 3, 4 | co 5666 | . 2 class (6 + 1) |
6 | 1, 5 | wceq 1290 | 1 wff 7 = (6 + 1) |
Colors of variables: wff set class |
This definition is referenced by: 7re 8566 7pos 8585 6p1e7 8615 4p3e7 8621 5p2e7 8623 6p2e8 8626 7nn 8643 6lt7 8661 7p7e14 9016 8p7e15 9022 9p7e16 9029 9p8e17 9030 7t7e49 9051 8t7e56 9057 9t7e63 9064 |
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