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Timeline for Old Links to PlanetMath have Broken

Current License: CC BY-SA 4.0

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Feb 12, 2022 at 4:44 answer added Calvin Khor timeline score: 3
Jan 17, 2022 at 17:08 answer added hardmath timeline score: 9
Jan 15, 2022 at 23:41 comment added hardmath @MartinSleziak: Since there are a couple of dozen of those and will require Wayback research, I've created a spreadsheet to keep track of fixes if possible. Per Glorfindel's approach, I'll bump no more than three a day (and be a bit churlish about posts that seem not worth the effort).
Jan 14, 2022 at 8:49 answer added Glorfindel timeline score: 15
Jan 14, 2022 at 8:25 history edited Calvin Khor CC BY-SA 4.0
deleted 1 character in body
Jan 14, 2022 at 7:28 comment added Martin Sleziak Looking at the post linked by @hardmath, I suppose that also the links containing planetmath.org/sites are broken. But in that case, I don't see any easy way to fix them. (Maybe some of them might be available in Wayback machine?)
Jan 14, 2022 at 6:06 history edited Calvin Khor CC BY-SA 4.0
added 1264 characters in body; edited tags
Jan 13, 2022 at 17:12 comment added Martin Sleziak I have asked this on Meta Stack Exchange: Can the mass-replacement tool also replace and remove? We'll see whether somebody with the knowledge of this tool will respond.
Jan 13, 2022 at 15:46 history became hot meta post
Jan 13, 2022 at 15:11 comment added hardmath Some history of broken links here to PlanetMath. I remember fixing some of these back then, after the site reorganized. I'd be glad to help.
Jan 13, 2022 at 14:22 comment added Martin Sleziak If we assume that the problematic posts are the ones containing planetmath.org/encyclopedia, I got about 180 posts. You can get them by searching for url:"*planetmath.org/encyclopedia*". I have also posted some SEDE queries here: chat.stackexchange.com/transcript/19138/2022/1/13
Jan 13, 2022 at 13:54 comment added Asaf Karagila Mod I think that the prudent thing is also to replace http:// with https://, if we're updating stuff.
Jan 13, 2022 at 13:53 comment added Asaf Karagila Mod Some related discussion recently on MathOverflow with regards to mass linkrot-correction: meta.mathoverflow.net/questions/5124/…
Jan 13, 2022 at 13:46 history asked Calvin Khor CC BY-SA 4.0