René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect rendering of math symbols","articleBody":"### Bug report\r\n\r\nReopened #12183 (part 2) as a separte issue to keep track of it:\r\n\r\n\u003e 2. The [Writing mathematical expressions](https://matplotlib.org/tutorials/text/mathtext.html) tutorial aquires all kinds of red symbols which dont belong there.\r\n\u003e \r\n\u003e ![image](https://user-images.githubusercontent.com/23121882/45818896-4cfc4780-bce3-11e8-8f8f-be86ea129443.png)  or   ![image](https://user-images.githubusercontent.com/23121882/45818914-5d142700-bce3-11e8-8150-12c13ca89274.png)\r\n\r\n\r\n#### Comment by @anntzer:\r\n\r\nI think I know how to fix the red mathtext symbols (you \"just\" need to patch the suitable docutils dicts and/or send a patch to docutils) but it's not going to be a priority for me, pinning to 1.7.9 in the meantime is fine.\r\n\r\n#### Alternative temporary workaround:\r\n\r\nPin Sphinx to \u003c1.8.0.\r\n","author":{"url":"https://github.com/timhoffm","@type":"Person","name":"timhoffm"},"datePublished":"2018-10-15T20:42:17.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/12532/matplotlib/issues/12532"}