Step
*
of Lemma
rmul-nonzero
∀x,y:ℝ. (x * y ≠ r0
⇐⇒ x ≠ r0 ∧ y ≠ r0)
BY
{ (EAuto 1
THEN D (-1)
THEN Try ((FLemma `rmul-is-negative` [-1] THEN Auto THEN D -1 THEN Auto))
THEN Try ((FLemma `rmul-is-positive` [-1] THEN Auto THEN D -1 THEN Auto)⋅)) }
1
1. x : ℝ@i
2. y : ℝ@i
3. (x * y) < r0@i
4. y < r0
⊢ x ≠ r0
2
1. x : ℝ@i
2. y : ℝ@i
3. (x * y) < r0@i
4. x < r0
⊢ y ≠ r0
Latex:
Latex:
\mforall{}x,y:\mBbbR{}. (x * y \mneq{} r0 \mLeftarrow{}{}\mRightarrow{} x \mneq{} r0 \mwedge{} y \mneq{} r0)
By
Latex:
(EAuto 1
THEN D (-1)
THEN Try ((FLemma `rmul-is-negative` [-1] THEN Auto THEN D -1 THEN Auto))
THEN Try ((FLemma `rmul-is-positive` [-1] THEN Auto THEN D -1 THEN Auto)\mcdot{}))
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