Step
*
of Lemma
multiply-is-int-iff
∀[a,b:Base]. uiff(a * b ∈ ℤ;(a ∈ ℤ) ∧ (b ∈ ℤ))
BY
{ TACTIC:((UnivCD THENA Auto) THEN RepeatFor 2 ((D 0 THENA Auto))) }
1
1. a : Base
2. b : Base
3. a * b ∈ ℤ
⊢ (a ∈ ℤ) ∧ (b ∈ ℤ)
2
1. a : Base
2. b : Base
3. (a ∈ ℤ) ∧ (b ∈ ℤ)
⊢ a * b ∈ ℤ
Latex:
Latex:
\mforall{}[a,b:Base]. uiff(a * b \mmember{} \mBbbZ{};(a \mmember{} \mBbbZ{}) \mwedge{} (b \mmember{} \mBbbZ{}))
By
Latex:
TACTIC:((UnivCD THENA Auto) THEN RepeatFor 2 ((D 0 THENA Auto)))
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