# Tighter fitting \boxed equation?

I use \boxed a lot to help me isolate elements in my notes. I would like to define a \snugboxed command so that it produces a tighter-fitting box than \boxed around the element inside my $..$ environment. Is that possible ?

for example in such code as this, ideally the box would fit the element inside tighter:

 $f_{n+1}(\theta) = E \theta^{Z_{n+1} } = E \left( \boxed{E\theta^{Z_{n+1}}|Z_n} \right) = \sum \boxed{E \left( \theta^{Z_{n+1}} | Z_n \right)} P(Z_n=k) \leftarrow \boxed{E \theta^{Z_{n+1}} | Z_n}$
is the random variable here !


thank you !

\boxed is just a thin wrapper around \fbox and so uses the same \fboxsep padding, so if you (locally, or for the whole document) use

\setlength\fboxsep{0pt}


You will get a tighter fitting frame.