Castellanos Peñuela, Julio Antonio2023-06-202023-06-2019900022-404910.1016/0022-4049(90)90003-Zhttps://hdl.handle.net/20.500.14352/58376We study Hamburger-Noether matrices over rings, obtaining some applications to deformations of curves and equisingularity. We also study a special type of them, the matrices of Arf.engjournal articlehttp://www.sciencedirect.com/science/article/pii/002240499090003Zhttp://www.sciencedirect.com/restricted access512Formal methodsdeformationsÁlgebra1201 Álgebra