Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > df-q | GIF version |
Description: Define the set of rational numbers. Based on definition of rationals in [Apostol] p. 22. See elq 8707 for the relation "is rational." (Contributed by NM, 8-Jan-2002.) |
Ref | Expression |
---|---|
df-q | ⊢ ℚ = ( / “ (ℤ × ℕ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | cq 8704 | . 2 class ℚ | |
2 | cdiv 7760 | . . 3 class / | |
3 | cz 8351 | . . . 4 class ℤ | |
4 | cn 8039 | . . . 4 class ℕ | |
5 | 3, 4 | cxp 4361 | . . 3 class (ℤ × ℕ) |
6 | 2, 5 | cima 4366 | . 2 class ( / “ (ℤ × ℕ)) |
7 | 1, 6 | wceq 1284 | 1 wff ℚ = ( / “ (ℤ × ℕ)) |
Colors of variables: wff set class |
This definition is referenced by: elq 8707 |
Copyright terms: Public domain | W3C validator |