Corank and normal equivolent of Infinite Matrices over a sfield are difined, and a proof that any row-column-finite infinite matrix over a sfield is existence and unique is given.

• 摘要定义了除环上无限方阵的余秩和正则等价，证明了除环上每个行列有限的无限方阵的余秩存在且唯一。