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Mirrors > Home > ILE Home > Th. List > nqex | GIF version |
Description: The class of positive fractions exists. (Contributed by NM, 16-Aug-1995.) (Revised by Mario Carneiro, 27-Apr-2013.) |
Ref | Expression |
---|---|
nqex | ⊢ Q ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-nqqs 7289 | . 2 ⊢ Q = ((N × N) / ~Q ) | |
2 | niex 7253 | . . . 4 ⊢ N ∈ V | |
3 | 2, 2 | xpex 4719 | . . 3 ⊢ (N × N) ∈ V |
4 | 3 | qsex 6558 | . 2 ⊢ ((N × N) / ~Q ) ∈ V |
5 | 1, 4 | eqeltri 2239 | 1 ⊢ Q ∈ V |
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