Step
*
2
2
1
of Lemma
combinations_aux_wf
.....aux.....
1. n : ℤ
2. 0 < n
3. ∀[b,m:ℕ]. (combinations_aux(b;n - 1;m) ∈ ℕ)
4. ¬(n = 0 ∈ ℤ)
5. b : ℕ
6. m : ℕ
7. ¬(m = 0 ∈ ℤ)
⊢ (m - 1)↓
BY
{ Auto }
Latex:
Latex:
.....aux.....
1. n : \mBbbZ{}
2. 0 < n
3. \mforall{}[b,m:\mBbbN{}]. (combinations\_aux(b;n - 1;m) \mmember{} \mBbbN{})
4. \mneg{}(n = 0)
5. b : \mBbbN{}
6. m : \mBbbN{}
7. \mneg{}(m = 0)
\mvdash{} (m - 1)\mdownarrow{}
By
Latex:
Auto
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