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May 23, 2023 at 14:00 history edited David E Speyer CC BY-SA 4.0
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May 23, 2023 at 13:24 history edited David E Speyer CC BY-SA 4.0
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May 23, 2023 at 13:13 history edited David E Speyer CC BY-SA 4.0
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May 23, 2023 at 8:58 comment added Dave Benson The columns of $M_3$ form a basis for the $E_8$ lattice that isn't a set of root vectors. I can't vouch for why it appears on Wikipedia.
May 23, 2023 at 2:26 history answered David E Speyer CC BY-SA 4.0