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  $lst_mean Translate the mathematical expression $emph expr$emphend,
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  $lst_mean Translate the mathematical expression $emph expr$emphend,
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  possibly with common user errors, into a machine-understandable
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  possibly with common user errors, into a machine-understandable
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  mathematical expression. <br>
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  mathematical expression. <br>
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  It will replace $emph (x+1)(x-1)$emphend into $emph (x+1)*(x-1)$emphend,
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  It will replace $emph (x+1)(x-1)$emphend into $emph (x+1)*(x-1)$emphend,
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  $emph 5x^3$emphend into $emph 5*x^3$emphend, etc.
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  $emph 5x^3$emphend into $emph 5*x^3$emphend, etc.
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  More precisely,
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 <ul><li>
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  Replace some badcharacters as **, ², ³.
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   </li><li>translate ++, +-, -+, ... into one sign
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   </li><li>
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   translate | | in abs
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   </li><li>
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   replace new lines or tabs by spaces
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   </li><li>
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   add zero in case of decimal digits if necessary : for example, replace 4. by 4.0  and .5 -> 0.5
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   </li><li>
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   replace justapositions by multiplications if rawmatheasy=yes
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   </ul>
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