I surf the net, but I can't find a clear example on how to type U like this. Could anyone show a related code example?
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\mathcal{U}with Palatino fonts (e.g. packagenewpxmath).newpxmathpackage that works for me. There are so many packages in Latex, I am new to it so I don't load this but the default one before. Moreover, I still don't know how to type the font in the question I asked before, where I find the style I want. Still thanks for your reply again. It is helpful not just the abundant text left!!!!\usepackage[cal=mma]{mathalfa}and then\mathcal{...}but that's a commercial font, so it won't work unless you have it...newpxmathpackage contain the commercial font?newpxis a free font. But themmain your other question is commercial (I think; anyway it's not part of TeX Live).