preview-latex – Preview equations in Emacs

Pre­view-la­tex al­lows ap­pro­pri­ately se­lected parts of a LaTeX doc­u­ment to be for­mat­ted and dis­played within your Emacs ed­i­tor, al­low­ing you to view what it looks like whilst still al­low­ing you to edit it.
Since ver­sion 11.80, pre­view-la­tex has been de­liv­ered as an in­te­gral part of AUCTeX.