Step
*
2
1
of Lemma
mul-distributes
1. ∀x,y,z:ℤ. ((x * (y + z)) = ((x * y) + (x * z)) ∈ ℤ)
2. z : Base
3. y : Base
4. x : Base
5. is-exception((x * y) + (x * z))
6. x * y ∈ ℤ
7. is-exception(x * z)
8. (x * y)↓
9. x ∈ ℤ
10. y ∈ ℤ
⊢ (x * y) + (x * z) ≤ x * (y + z)
BY
{ TACTIC:ExceptionCases (-4) }
1
1. ∀x,y,z:ℤ. ((x * (y + z)) = ((x * y) + (x * z)) ∈ ℤ)
2. z : Base
3. y : Base
4. x : Base
5. is-exception((x * y) + (x * z))
6. x * y ∈ ℤ
7. is-exception(x * z)
8. (x * y)↓
9. x ∈ ℤ
10. y ∈ ℤ
11. x ∈ ℤ
12. is-exception(z)
⊢ (x * y) + (x * z) ≤ x * (y + z)
2
1. ∀x,y,z:ℤ. ((x * (y + z)) = ((x * y) + (x * z)) ∈ ℤ)
2. z : Base
3. y : Base
4. x : Base
5. is-exception((x * y) + (x * z))
6. x * y ∈ ℤ
7. is-exception(x * z)
8. (x * y)↓
9. x ∈ ℤ
10. y ∈ ℤ
11. is-exception(x)
⊢ (x * y) + (x * z) ≤ x * (y + z)
Latex:
Latex:
1. \mforall{}x,y,z:\mBbbZ{}. ((x * (y + z)) = ((x * y) + (x * z)))
2. z : Base
3. y : Base
4. x : Base
5. is-exception((x * y) + (x * z))
6. x * y \mmember{} \mBbbZ{}
7. is-exception(x * z)
8. (x * y)\mdownarrow{}
9. x \mmember{} \mBbbZ{}
10. y \mmember{} \mBbbZ{}
\mvdash{} (x * y) + (x * z) \mleq{} x * (y + z)
By
Latex:
TACTIC:ExceptionCases (-4)
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