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Two days ago, I saw a stochastic process question which contained images that could be completely $\rm\TeX$ified. Based on several related questions found on this site, I think those images should be converted to $\rm\TeX$(t) so that the whole question would be searchable. In principle, the question itself should "contain enough stand-alone context". (See remarks below.)

Though the images uploaded on i.stack.imgur.com have stable URLs, are they regarded as "external content" as in the accepted answer for this MathMeta.SE question?

According to answer for the question Should I edit a question everytime I see an image in it?, every text-and-$\rm\LaTeX$ image should be converted to $\rm\TeX$(t) no matter how old the post is. As a result, I copied the following comment from the comment template list without much thinking in order to ask the question writer to typeset the math.

Please do not use pictures for critical portions of your post. Pictures may not be legible, cannot be searched and are not view-able to some, such as those who use screen readers.

In retrospect, I should have used another one from D.W.

Don't use images as main content of your post. This makes your question impossible to search and inaccessible to the visually impaired. Please transcribe text and mathematics (note that you can use LaTeX) and don't forget to give proper attribution to your sources.

Even though the uploaded images in the question are not scanned pages, I believe that the arguments from the Meta.SE moderator for the question Allowed to post scanned page from text book on SE can be applied to this situation.

What can be done to stop the question writer from using this "shortcut to not having to type anything" if he/she refuses to typeset the material using MathJax?

Since this question is cross-posted on MO, can the arguments of the Meta.SE moderator be also applied on MO?

Remarks: I understand that in practice, geometry questions with some geometric figure(s) are acceptable since we won't expect users to write them in an ancient-Greek style.

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