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I would like to solve a problem but I am not able to do it. Precisely I am creating figures and I should insert mathematical formulas. The first thing I do is to create a .pdf file from a .tex source and then edit it in Adobe Illustrator. I can change the symbols, but, for example, the square root is not perfectly viewable and in its place I see a rectangle with a cross. There is some strategy to solve this problem?

I have attached the related images created first with the LaTeX, and then edited with Adobe Illustrator.

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I think you need a specific mathematical symbols font for it.

You can make the square root from the Glyphs Panel using Mathematical Pi Lt Std font from fonts.com, and combining two characters:

enter image description here

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    I have now upvoted your excellent answer. I hope that my question is good and the prevoius my question. – Sebastiano May 29 '18 at 8:04

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