English
The rank of A equals the dimension of the image of the associated linear map, i.e., rank(A) = dim_R(range(A.mulVecLin)).
Русский
Ранг A равен размерности образа соответствующего линейного отображения: rank(A) = dim_R(range(A.mulVecLin)).
LaTeX
$$$\operatorname{rank}(A) = \dim_R(\operatorname{range}(A\!:\!\mathrm{mulVecLin})).$$$
Lean4
/-- The rank of a matrix is the rank of its image. -/
noncomputable def rank (A : Matrix m n R) : ℕ :=
finrank R <| LinearMap.range A.mulVecLin