Step
*
1
1
of Lemma
qdiv_functionality_wrt_qless
1. a : ℚ
2. b : ℚ
3. c : ℚ
4. d : ℚ
5. 0 ≤ a
6. 0 < d
7. a < b
8. c ≥ d
⊢ a * d < b * c
BY
{ (UnfoldTopAb (-1) THEN QMul ⌜b⌝ (-1)⋅ THEN Auto) }
1
1. a : ℚ
2. b : ℚ
3. c : ℚ
4. d : ℚ
5. 0 ≤ a
6. 0 < d
7. a < b
8. (b * d) ≤ (b * c)
⊢ a * d < b * c
Latex:
Latex:
1. a : \mBbbQ{}
2. b : \mBbbQ{}
3. c : \mBbbQ{}
4. d : \mBbbQ{}
5. 0 \mleq{} a
6. 0 < d
7. a < b
8. c \mgeq{} d
\mvdash{} a * d < b * c
By
Latex:
(UnfoldTopAb (-1) THEN QMul \mkleeneopen{}b\mkleeneclose{} (-1)\mcdot{} THEN Auto)
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