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15

Use \mathcal I_1 to get $\mathcal I_1$.


9

This turns out to be an interaction between StackExchange's Markdown processor and MathJax. Here's what's going on: in the editor, the preview code has to remove the mathematics before it is processed by Markdown (so that the mathematics isn't changed by Markdown) and then puts it back in the text of the post. It does that by looking for the math ...


6

Some of the omitted symbols here were thought to have already appeared earlier in Unicode. Your Wikipedia table says in a note The reserved code points (the "holes") in the alphabetic ranges up to U+1D551 duplicate characters in the Letterlike Symbols block For example U+2110 is "Script Capital I" and looks like ℐ allowing U+1D4A4 to be ignored ...


5

No, you're right that mathjax doesn't recognize $\cosec(x)$: $\cosec(x)$, but it recognizes $\csc(x)$: $\csc(x)$ for use when you want to denote cosecant(x). It is likely due to the fact that \sin(x), \cos(x), \tan(x), \sec(x), \cot(x) all have three-letter operator-names, and so the choice of operator for cosecant, in mathjax, similarly has a three-letter ...


5

The numbers are not inappropriate. This is a standard font. You can change the font on your side, if you want to. Of course basically everybody else will still see it differently. Some instructions are here How to change all fonts on Stack Exchange sites? You should not use MathJax here for writing these numbers either. That is inappropriate. You should ...


4

As hinted at in a comment you can write $\{f: \text{ for all } x, f < x\}$ $\{f: \text{ for all } x, f < x\}$


2

Is there a way to make the Greek letters displayed upright (non-italic)? Asked in comment. There is a way using unicode characters, for which one can search here: http://unicode-table.com/en. Normal use of phi is $\phi = ...$, which gives $\phi = ...$. Looking up phi on the above site gives a couple of results, if one uses 'Greek Capital Letter Phi' and ...


2

I believe that the most elegant solution of the problem is @ChristianBlatter’s, namely to convert a direct question, such as “Who are you?” to an indirect question: “I’d like to know who you are.” Note that a direct question is an interrogative sentence and takes the question mark, while an indirect question is (usually) declarative, and properly takes no ...


2

For me the allowed punctuations at the end of a displayed equation are $$[{\rm no\ punctuation}]\qquad.\qquad,\qquad;\qquad\square\qquad,$$ where $\square$ is a widely used sign for $\langle$q.e.d.$\rangle$ . In the example of the OP one could easily write I was wondering where does the formula for redshift $$z=\frac vc$$ come from. Can it be derived ...


1

mathjax now supports auto numbering line, but turn off by default. Usage <script> window.MathJax = { tex: { tags: "ams" } }; </script> <script type="text/javascript" id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js" ></script> Now all ...


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