Corrections to the version of Algebraic Topology with a clickable index.

Last updated October 26, 2022.

• Section 2.2, page 152, four lines above the big commutative diagram. A clarification: "the interiors of C and D" means "the interiors of C and D in Y". (10/26/2022)
• Section 3.2, page 215. Some of the text on this page has been revised slightly for clarity. (10/23/2022)
• Section 3.B, page 274. In the statement of Theorem 3B.5 delete the parenthesis immediately preceding Tor. (10/14/2022)
• Section 3.B, page 275, line 2. The last subscript in this line should be n-i-1 instead of n-i. (10/14/2022)
• Section 4.1, page 358. In Exercise 5 change the coset alpha H to H alpha. [Explanation: I usually think of the relative pi_1 as homotopy classes of paths from the basepoint to the subspace, but the actual definition on page 343 uses paths in the opposite direction, from points in the subspace to the basepoint.] (6/2/2021)
• Section 4.1, page 358, Exercise 9, first line. Change i^* to i_*. (6/2/2021)
• Appendix, page 529, line before Corollary A.12. The reference should be to Corollary A.9 instead of Corollary A.10. (2/10/2021)
• Index. In the entry for cup product add the page number 206, which is where the cup product is first defined. (5/26/2022)