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Dec 31, 2022 at 12:37 history edited Martin Sleziak CC BY-SA 4.0
http -> https (the question was bumped anyway)
Apr 29, 2016 at 15:26 comment added TonyK @JeppeStigNielsen: If you read the relevant Wikipedia article, then you will know as much as I do about congruent numbers :-)
Apr 29, 2016 at 15:10 comment added Jeppe Stig Nielsen I have not read the reference, but is it true that no currently known (unconditional) general algorithm (allowed to be slow) can determine if an integer $n$ is congruent or not? Can you mention a particular $n$ for which the status (congruent or not) is unknown?
Jun 4, 2010 at 19:45 comment added Steve Huntsman Not as old or well-defined, but the systematic construction of quasicrystals appeared to be considered around 1200 CE: peterlu.org/content/…
Jun 4, 2010 at 19:10 history answered TonyK CC BY-SA 2.5