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I'm following along with Kreyszig's intro to functional analysis text, where he uses $X$ to indicate an abstract set, and often uses $x$ to indicate an element of $X$. I want to match his notation, but in a way that--when handwritten--makes a clear distinction between the upper and lower case letters. My normal lowercase $x$ is more curvy, but I feel like that's not enough, and adding serifs by hand for the big $X$ is too cumbersome. I did see a professor that just swiped a line across the top of an x-shape to indicate the big $X$ but that looked sloppy to me. Maybe I'm just being too anal about it, but I like my math writing to look good. Any suggestions?


I threw the functional-analysis tag on here because this is the context in which my question seems most relevant.


Edit: Consider that the cartesian product symbol $\times$ causes some interference as well.

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  • $\begingroup$ You could also make the top angle in "X" smaller. $\endgroup$ – Alberto Takase Feb 4 at 9:28
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One way I’ve seen others do this is to write the lowercase ‘x’ smaller, and write the uppercase ‘x’ bigger, with the end points extended in a line like this:

uppercase X

I apologize for the picture in advance. It seemed the easiest way to write the notation.

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  • $\begingroup$ Thanks, yeah that's how I've been doing it, and it looks good, but it takes a lot of energy (relatively) to add those serifs on. $\endgroup$ – Zduff Feb 3 at 18:02

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