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Jun 17, 2012 at 23:54 comment added Patricia Hersh Too bad MathOverflow doesn't have style points.
Jun 15, 2012 at 3:41 history edited Tom Goodwillie CC BY-SA 3.0
added 84 characters in body
Jun 15, 2012 at 3:34 comment added Kevin Walker Isn't the intersection of the boundaries of the (2-dimensional) triangles a union of three 0-spheres in this case?
Jun 15, 2012 at 3:03 history answered Tom Goodwillie CC BY-SA 3.0