# Problems with \hat+ and spacing

Having an arbitrary document, inside math mode spacing works great when addition is used.

x'=x_1 + x_2 + \cdots + x_n

but when + changes to \hat+ like in

x'=x_1 \hat+ x_2 \hat+ \cdots \hat+ x_n

the spacing does not work well.

• \mathbin{\hat{+}} – Manuel Jan 16 '18 at 12:28

You can use \mathbin{\hat{+}}. Or define a macro
\newcommand*\hatplus{\mathbin{\hat{+}}}

I thought it was necessary to add \DOTSB to give the info to \dots to see wether use center dots or lower dots, but it seems that it's intelligent enough to see \mathbin.