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Started some minimum. This configuration was an early source of speculation of higher structures in M-theory, since it generalizes the binary string junctions between D-branes that carry gauge fields to something trinary.
I left a brief remark on that.
But for the moment what I wanted to mainly record is the remark that if one does accept the story of the M-theory lift of gauge enhancement on D6-branes, in terms of M2-branes wrapping 2-spheres that touch along the shape of a Dynkin diagram blowup of an ADE-singularity, then such triple membrane junctions must correspond to blowups of the dihedral ADE-singularities as well as the three exceptional cases, since in these cases the Dynkin diagram has a triple junction node.
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