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/* Referencedesigner.com Mathjax tutorial - Subscript */ A simple equation showing usage of subscript
$$x_1 +x_2+ x_3 = 43 $$
You can use curly brackets to render subscript so length more than 1 character.
$$x_{i1}$$
You will also have to use curly bracket to render sub subscript.
$$x_{i_2}$$
Notice that x_i_2 in above will render error.
Subscripts can be combined with superscript as in
$$x_i^2$$
Aubscripts can also be applied before a literal as in
$$_bx^c$$