# [texhax] floor and ceiling

P. R. Stanley prstanley at ntlworld.com
Thu Mar 5 00:15:16 CET 2009

> >\lfloor is the left side of the the floor bracket, and \rfloor the
> >>right. \lfloor looks kind of like a capital L, while \rfloor is the
> >>mirror image. If the innards of the bracket is tall (like a \frac,
> >>for example) using $\left\lfloor \frac{n}{2} \right\rfloor$ would be
> >>best. \ceil is similar.
> >>
> >>Great! Thanks. What do lceil and rceil look like?
>
>To continue with Robert's L-based description: \lceil and \rceil look
>just like \lfoor and \rfloor, but they're flipped vertically (that is,
>reflected about their central horizontal axis).  So the \lceil looks
>like an inverted capital L and the \rceil looks like turned capital L
>(i.e., an L that has been rotated 180 degrees).
>
>The floor and ceiling brackets don't have serifs -- just two
>perpendicular lines.  To me, they look more like square brackets [ and
>] with either the top or bottom horizontal strokes removed.  (The
>bottom strokes are removed for ceiling, and the top strokes are
>removed for floor.)
>
>11 out of 10 for a clear and precise description! Cheers!

>--Kevin Godby