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Definition df-ltpq 6444
 Description: Define pre-ordering relation on positive fractions. This is a "temporary" set used in the construction of complex numbers, and is intended to be used only by the construction. Similar to Definition 5 of [Suppes] p. 162. (Contributed by NM, 28-Aug-1995.)
Assertion
Ref Expression
df-ltpq <pQ = {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ (N × N) ∧ 𝑦 ∈ (N × N)) ∧ ((1st𝑥) ·N (2nd𝑦)) <N ((1st𝑦) ·N (2nd𝑥)))}
Distinct variable group:   𝑥,𝑦

Detailed syntax breakdown of Definition df-ltpq
StepHypRef Expression
1 cltpq 6376 . 2 class <pQ
2 vx . . . . . . 7 setvar 𝑥
32cv 1242 . . . . . 6 class 𝑥
4 cnpi 6370 . . . . . . 7 class N
54, 4cxp 4343 . . . . . 6 class (N × N)
63, 5wcel 1393 . . . . 5 wff 𝑥 ∈ (N × N)
7 vy . . . . . . 7 setvar 𝑦
87cv 1242 . . . . . 6 class 𝑦
98, 5wcel 1393 . . . . 5 wff 𝑦 ∈ (N × N)
106, 9wa 97 . . . 4 wff (𝑥 ∈ (N × N) ∧ 𝑦 ∈ (N × N))
11 c1st 5765 . . . . . . 7 class 1st
123, 11cfv 4902 . . . . . 6 class (1st𝑥)
13 c2nd 5766 . . . . . . 7 class 2nd
148, 13cfv 4902 . . . . . 6 class (2nd𝑦)
15 cmi 6372 . . . . . 6 class ·N
1612, 14, 15co 5512 . . . . 5 class ((1st𝑥) ·N (2nd𝑦))
178, 11cfv 4902 . . . . . 6 class (1st𝑦)
183, 13cfv 4902 . . . . . 6 class (2nd𝑥)
1917, 18, 15co 5512 . . . . 5 class ((1st𝑦) ·N (2nd𝑥))
20 clti 6373 . . . . 5 class <N
2116, 19, 20wbr 3764 . . . 4 wff ((1st𝑥) ·N (2nd𝑦)) <N ((1st𝑦) ·N (2nd𝑥))
2210, 21wa 97 . . 3 wff ((𝑥 ∈ (N × N) ∧ 𝑦 ∈ (N × N)) ∧ ((1st𝑥) ·N (2nd𝑦)) <N ((1st𝑦) ·N (2nd𝑥)))
2322, 2, 7copab 3817 . 2 class {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ (N × N) ∧ 𝑦 ∈ (N × N)) ∧ ((1st𝑥) ·N (2nd𝑦)) <N ((1st𝑦) ·N (2nd𝑥)))}
241, 23wceq 1243 1 wff <pQ = {⟨𝑥, 𝑦⟩ ∣ ((𝑥 ∈ (N × N) ∧ 𝑦 ∈ (N × N)) ∧ ((1st𝑥) ·N (2nd𝑦)) <N ((1st𝑦) ·N (2nd𝑥)))}
 Colors of variables: wff set class This definition is referenced by: (None)
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