All fashionable characters, such as ∧, ∀, and ∃, do not have code points in the input t12 packet, but utf8x. How to tell emacs to pass parameter utf8xwhen creating pdf via org-export?
utf8x
org-export
For example, as follows:
#+LATEX_HEADER: \usepackage[utf8x]{inputenc}
You can find additional examples in the following file ...