English
For p,q ∈ ℚ≥0 with p,q ≥ 0, toNNRat(q+p) = toNNRat q + toNNRat p.
Русский
Для p,q ∈ ℚ≥0 выполняется toNNRat(q+p) = toNNRat q + toNNRat p.
LaTeX
$$$\operatorname{toNNRat}(q+p) = \operatorname{toNNRat}(q) + \operatorname{toNNRat}(p)\quad( p,q \ge 0 ).$$$
Lean4
@[simp]
theorem toNNRat_add (hq : 0 ≤ q) (hp : 0 ≤ p) : toNNRat (q + p) = toNNRat q + toNNRat p :=
NNRat.ext <| by simp [toNNRat, hq, hp, add_nonneg]