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Jul 30, 2022 at 12:08 comment added wlad I put a depiction of the quiver $D_4$ in. I messed around with alignment until it looked about right.
Jul 30, 2022 at 12:07 history edited wlad CC BY-SA 4.0
attempted to draw the quiver D_4
Nov 21, 2021 at 9:00 comment added Duchamp Gérard H. E. I like you line of proof (+1). Cannot this be reformulated as "In order that a collection of subspaces in a f.d. space satisfy the dimension formula, it is necessary and sufficient that they generate a distributive sublattice of that of subspaces" i.e. "that the set of atoms of the sublattice generated be in direct sum position" ?
Jun 1, 2010 at 17:01 history answered Vladimir Dotsenko CC BY-SA 2.5