English
If IsRelPrime x y, and x divides z and y divides z, then x·y divides z.
Русский
Если IsRelPrime(x,y), и x|z, и y|z, то x·y|z.
LaTeX
$$$\text{IsRelPrime}(x,y) \rightarrow (x \mid z) \rightarrow (y \mid z) \rightarrow (x \cdot y) \mid z$$$
Lean4
/-- The type of dual numbers, numbers of the form $a + bε$ where $ε^2 = 0$.
`R[ε]` is notation for `DualNumber R`. -/
abbrev DualNumber (R : Type*) : Type _ :=
TrivSqZeroExt R R