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Defined on pages 56, 190
Used on Chap. 4: pages 56, 69, 72, 74; Chap. 7: page 145; Chap. 8: page 159; Chap. 9: pages 183, 184, 190, 191, 197; Chap. 10: page 213; Chap. 19: page 476
Also known as optimality