The embedded objects manual teaches us that by using the arydshln package one can create tables with horizontal/vertical dashed lines.
However, I want to do the same in the math environment. I need to represent matrices in block-diagonal notation and the use of dashed lines is one way to distinguish the different parent matrices. In math mode I can create horizontal dashes within a pmatrix inserting \hdashline before the first element of a given line in order to put the dash over it. However, for the vertical dashes, I had to resort to ERT: ====================== (within the ERT): \[ \left(\begin{array}{c:c} a & b \\ \hdashline c & d \end{array}\right) \] ====================== Notice the "{c:c}" that puts the vert dash between the columns. It works but it's not wysiwyg... is there no other way to do this within LyX? Thanks. -- Rudi Gaelzer Institute of Physics Federal University of Rio Grande do Sul BRAZIL Registered linux user # 153741