Could anybody please help me figuring out what the different beasts in math are? Currently there is a hierarchy that looks like: Inset (abstract base) / | \ Dim Char MacroArg (thing that need (for things formerly the width_/ascent_ known as characters) /descent_ cache) / \ Nest Dots Func Space Symbol (for thing with nested content) | \ Grid Decoration Delim Frac Macro Root Script Sqrt / \ Array "Matrix" (base for eqnarray/align/...) The current "Symbol" inset is probably a bit to big, it contains things like \int, \sum (i.e. things that grow in displayed environments and can take limits) greek characters (that can't take limits) \sup, \inf (thing that don't grow, aren't exactly symbols, but take limits) and probabably a few more (some seemingly inserting extra space around themselves, when drawn, like '+' and '-') So the question is: What groups of "symbols" exist for LaTeX? What "characteristics" do they have? Andre' -- André Pönitz ............................................. [EMAIL PROTECTED]