English
The ring of integers ℤ forms a NormedComRing with the usual absolute value as norm.
Русский
Целые числа образуют NormedCommRing, нормa задаётся как обычное абсолютное значение.
LaTeX
$$$ \\text{NormedCommRing}(\\mathbb{Z}) \\text{ with } \\|m\\| = |m|.$$$
Lean4
/-- Normed ring structure on the product of finitely many normed rings, using the sup norm. -/
instance normedRing {R : ι → Type*} [Fintype ι] [∀ i, NormedRing (R i)] : NormedRing (∀ i, R i) :=
{ Pi.seminormedRing, Pi.normedAddCommGroup with }