Displaying Math Symbols in Message Boxes

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Hi

What should I do to display math symbols, typed in latex, in the message box?
 
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It should just appear when you refresh the page (after you do a preview)
 
Thanks - got it. You type e.g. (tex) \sum (/tex). (With square brackets), giving \sum.
 
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\nabla
 
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Hi, I was watching the following video. I found some points confusing. Could you please help me to understand the gaps? Thanks, in advance! Question 1: Around 4:22, the video says the following. So for those mathematicians, negative numbers didn't exist. You could subtract, that is find the difference between two positive quantities, but you couldn't have a negative answer or negative coefficients. Mathematicians were so averse to negative numbers that there was no single quadratic...
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