The \mathscr problem is simply that Org mode LaTeX doesn't by default load the LaTeX package that provides that command. Just add #+LATEX_HEADER: \usepackage{mathrsfs} to your Org file and that should fix both preview and PDF export. Unfortunately it is more complicated than that @George, I think you need to add an entry to As for getting unicode math to work, you need, again, to load a package (so add #+LATEX_HEADER: \usepackage{unicode-math} to your Org file), but there's a wrinkle this time: the unicode-math package doesn´t work with pdflatex, only xetex or luatex, so you additionally need to customize the org-latex-pdf-process variable (for PDF export) and the org-preview-latex-process-alist and org-preview-latex-default-process variables (for LaTeX preview) to choose one of those compilers.

The \mathscr problem is simply that Org mode LaTeX doesn't by default load the LaTeX package that provides that command. Just add #+LATEX_HEADER: \usepackage{mathrsfs} to your Org file and that should fix both preview and PDF export.

As for getting unicode math to work, you need, again, to load a package (so add #+LATEX_HEADER: \usepackage{unicode-math} to your Org file), but there's a wrinkle this time: the unicode-math package doesn´t work with pdflatex, only xetex or luatex, so you additionally need to customize the org-latex-pdf-process variable (for PDF export) and the org-preview-latex-process-alist and org-preview-latex-default-process variables (for LaTeX preview) to choose one of those compilers.

The \mathscr problem is simply that Org mode LaTeX doesn't by default load the LaTeX package that provides that command. Just add #+LATEX_HEADER: \usepackage{mathrsfs} to your Org file and that should fix both preview and PDF export.

As for getting unicode math to work, you need, again, to load a package (so add #+LATEX_HEADER: \usepackage{unicode-math} to your Org file), but there's a wrinkle this time: the unicode-math package doesn´t work with pdflatex, only xetex or luatex, so you additionally need to customize the org-latex-pdf-process variable to choose one of those.

The \mathscr problem is simply that Org mode LaTeX doesn't by default load the LaTeX package that provides that command. Just add #+LATEX_HEADER: \usepackage{mathrsfs} to your Org file and that should fix both preview and PDF export. Unfortunately it is more complicated than that @George, I think you need to add an entry to As for getting unicode math to work, you need, again, to load a package (so add #+LATEX_HEADER: \usepackage{unicode-math} to your Org file), but there's a wrinkle this time: the unicode-math package doesn´t work with pdflatex, only xetex or luatex, so you additionally need to customize the org-latex-pdf-process variable (for PDF export) and the org-preview-latex-process-alist and org-preview-latex-default-process variables (for LaTeX preview) to choose one of those compilers.