Does anyone know a way to get half-vertical lines? I mean, I'd like something identical to /vline , but which starts from the top of the row and only goes halfway down. Similarly, I'd like a line which starts from the bottom and only goes halfway up. Even better would be something like a corner but where the corner has it's horizontal bit in the middle of the line, and where the vertical portion lines up with \vline in the tabular environment. (Basically, I'm trying to make a long bracket-thingy. I'm typesetting some logic proofs and these long brackets are sometimes used for setting-off subproofs. \vline is perfect for making a long line which spans multiple rows. But I can't quite get the top and bottom to look right.) Thanks for any help!!!