Raja Zubair schrieb:
I am using Lyx 1.5.0. beta3. I have looked thoroughly in the math toolbar and I am unable to find ceiling or floor symbol in it. Can anybody any idea about how to get it.
Click on the item with a blue box surrounded by brackets in the math toolbar. This opens the delimiter dialog.
Alternatively you can use the menu Insert -> Math -> Delimiters. There you fing the floor and ceiling delimiters. regards Uwe
