Step
*
of Lemma
qmul_functionality_wrt_qless1
∀[a,b,c,d:ℚ]. (a * c < b * d) supposing (c < d and (a ≤ b) and (0 ≤ d) and 0 < a)
BY
{ (Auto THEN QMul ⌜a⌝ (-1)⋅ THEN QMul ⌜d⌝ (-2)⋅ THEN Auto) }
Latex:
Latex:
\mforall{}[a,b,c,d:\mBbbQ{}]. (a * c < b * d) supposing (c < d and (a \mleq{} b) and (0 \mleq{} d) and 0 < a)
By
Latex:
(Auto THEN QMul \mkleeneopen{}a\mkleeneclose{} (-1)\mcdot{} THEN QMul \mkleeneopen{}d\mkleeneclose{} (-2)\mcdot{} THEN Auto)
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