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when toggle format what by license comment
Oct 10, 2023 at 6:16 comment added Charles Wang Whoops, I didn't specify - $X$ is defined the same way as it is in your answer.
Oct 9, 2023 at 20:46 comment added Martin Brandenburg I don't understand much, let's start with ... what is $X$?
S Oct 9, 2023 at 17:09 review First answers
Oct 9, 2023 at 17:33
S Oct 9, 2023 at 17:09 history answered Charles Wang CC BY-SA 4.0