4 ms·
They mean "unsolved" in the sense that for eg we cant prove or disprove claims like "all integers are the sum of three cubes".
by zodiac 7y ago
They mean "unsolved" in the sense that for eg we cant prove or disprove claims like "all integers are the sum of three cubes".
- zodiac 7y agoOops: Every cube is within one of a multiple of nine, which means every sum of three cubes is within three of a multiple of nine. So numbers of the form 9k+4 or 9k+5 cannot be expressed as the sum of three cubes. It’s conjectured that every other whole number can be. https://twitter.com/robinhouston/status/1169938974246342658?s=19 https://twitter.com/robinhouston/status/1169938974246342658?...