In this chapter we will tackle matters related to input encoding, typesetting diacritics and special characters. In the following document, we will refer to special characters for all symbols other than the lowercase letters a—z, uppercase letters A-Z, figures 0—9, and English punctuation marks. Some languages usually need a dedicated input system to ease document writing. This is the case for Arabic, Chinese, Japanese, Korean and others.
LaTeX/Special Characters - Wikibooks, open books for an open world
Lucky you. The Mac app is finally stable enough. See how it works on Vimeo. Download the latest version here. Restriction: In addition to the LaTeX command the unlicensed version will copy a reminder to purchase a license to the clipboard when you select a symbol.
Here are a couple examples, plus many other negations; it works for many of the many others as well. This is a bug as far as we know. Depending on the version of this is not always a problem.