CREATE TABLE table_52013 ("D 40 \\u221a" TEXT, "D 41 \\u221a" TEXT, "D 42 \\u221a" TEXT, "D 43 \\u221a" TEXT, "D 44 \\u221a" TEXT, "D 45 O" TEXT, "D 46 O" TEXT, "R 53 +" TEXT, "R 52 +" TEXT, "R 51 +" TEXT)

Name th D 43 when R 51 + is r 30
SELECT "D 43 \u221a" FROM table_52013 WHERE "R 51 +" = 'r 30'
SELECT "D 43 \u221a" FROM "table_52013" WHERE "R 51 +" = 'r 30'