Corrections
DOI: 10.1063/1.2914832
May 1982, page 28—center column, three lines above “Smectic phases”: “thin films” should be “defects.”
page 28—third column, lines following equation 2 should read: “where the nematic free energy density
page 29—center column, 23 lines up from bottom, should read: “r∥−η”
page 31—left column, last paragraph should read “.…vivid examples in three dimensions of ideas that arose in lower dimensions; one of the most exciting advances…”