From the faculty perspective, the widespread availability of the solution manual has broken the traditional homework model. A common story: a professor assigns every odd-numbered problem (answers in the back of the textbook). But the solution manual contains the even problems too. So students simply look up answers for all assignments.

Vector Differential and Integral Calculus (Grad, Div, Curl, and integral theorems).

Technically, the solution manual is copyrighted and marked “Instructor Use Only.” Distributing it without permission violates the publisher’s (Wiley) terms. Universities regularly file DMCA takedowns for publicly hosted copies.