2.1 ?????
  2.1.1 TeX Engine
  2.1.2 latex.ltx
  2.1.3 plain.sty
  2.1.4 Palin + LaTeX
  2.1.5 Amsmath
  2.1.6 amsopn
 2.2 Eqnarray
 2.3 Big, BIG, ....
 2.4 stackrel
  2.4.1 fontmath.ltx
 2.5 Limits of Sub- snd Super- Scripts
  2.5.1 Outline
  2.5.2 Simultaneously Sub- and Super- Scripts
  2.5.3 Superscripts
  2.5.4 Subscripts
 2.6 Sized Operations
 2.7 Accent through ‘accents’ Configurations
 2.8 Underline and Overline
 2.9 Footnotes
 2.10 Space Characters
 2.11 Matrices
  2.11.1 Aligned
  2.11.2 Cases
  2.11.3 matrix
  2.11.4 pmatrix
 2.12 TeX
 2.13 Fractions