In particular why math mode for the first (because of the \cdot) but not the others You should almost never number anything explicitly in LaTeX it is set up to.
An online LaTeX editor that's easy to use. 1 Introduction; 2 Unordered lists; 3 Ordered lists; 4 Nested Lists; 5 List styles. 5.1 Ordered Arabic number (1, 2, 3.
This document lists 14283 symbols and the corresponding LATEX commands that produce them. Some of Table 4: ℳ Commands Defined to Work in Both Math and Text Mode. .. Table 123: ℳ Inequalities.
4 Typing math. 140. 5 Multiline math displays. 180. III Document structure. 209. 6 LATEX documents. 211. 7 Standard LATEX document classes. 235.