The errata section of the book "Discrete-Time Signal Processing, 3e" by A. V. Oppenheim and R. W. Schafer lists corrections made in the second, third, and fourth printings. These corrections address various errors and typos found in the text, figures, and equations across chapters 1 through 12. Specific corrections include: - Replacing "square brackets" with "curly braces" in Chapter 4. - Correcting axis labels and equation references in Figures 4.20(e) and 4.28. - Correcting equations and problem labels in various sections. - Correcting multiplicity indicators in Chapter 5. - Correcting equation numbers and text in Chapter 7. - Correcting sequence labels and equation exponents in Chapter 8. - Correcting footnotes and equation formats in Chapter 9. - Correcting equation limits and problem references in Chapter 11. - Correcting scales in Figures 5.4(b) and 5.6 in Chapter 5. - Correcting numerical values and equation limits in subsequent chapters. The last update to the errata was on April 20, 2015.The errata section of the book "Discrete-Time Signal Processing, 3e" by A. V. Oppenheim and R. W. Schafer lists corrections made in the second, third, and fourth printings. These corrections address various errors and typos found in the text, figures, and equations across chapters 1 through 12. Specific corrections include: - Replacing "square brackets" with "curly braces" in Chapter 4. - Correcting axis labels and equation references in Figures 4.20(e) and 4.28. - Correcting equations and problem labels in various sections. - Correcting multiplicity indicators in Chapter 5. - Correcting equation numbers and text in Chapter 7. - Correcting sequence labels and equation exponents in Chapter 8. - Correcting footnotes and equation formats in Chapter 9. - Correcting equation limits and problem references in Chapter 11. - Correcting scales in Figures 5.4(b) and 5.6 in Chapter 5. - Correcting numerical values and equation limits in subsequent chapters. The last update to the errata was on April 20, 2015.