Why TeX isn't the answer!
Simple to enter, and inspired by TeX
Designed to allow wysiwyg editing
Rendering on Dumb terminals
Rendering to Braille, Speech, ... y=sum_i=1_^n^{1<over>1+x_i_}
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n --- 1 y = > ------ --- i i = 1 1 + x | |||
| Yielding: | and on a dumb terminal: | ||