Transcription of Chemical Formulas and Mathematical Expressions

To ensure that document files can be viewed on various operating systems, we have decided to insert images of chemical formulas and mathematical formulas into the document on the lower half of the screen. For example, the image might be displayed on the left edge and the following document on the right-hand side. It remains a challenge to overcome technical limitations and display each image in its proper position in the document. For the time being, chemical formulas, mathematical formulas, and all numbers with exponents are transcribed as follows.

Accurate transcription Alternative transcription
H2O H2O
or
H_2O
(CH)n (CH)n
or
(CH)_n
La2-xSrxCuO4 La2-xSrxCuO4
or
La_{2-x}Sr_xCuO_4
10-20 10^{-20}
x2 x^2
xij xij
or
x_{ij}