A: No official one exists. However, the exercises are designed to be pedagogical. Many solutions can be inferred by reading the next section. For the tough ones, Physics Stack Exchange has excellent threads.
Relates temperature to imaginary time, allowing researchers to evaluate partition functions through path integrals over periodic or anti-periodic boundary conditions. Real-Time Formalism: thermal field theory le bellac pdf
: A self-contained introduction to using functional integrals at finite temperature. A: No official one exists
Given the popularity of the keyword, you will find links to downloadable PDFs. Many sites offering the free PDF are violating copyright. Cambridge University Press holds the rights, and illegal downloads harm academic publishing. A: No official one exists. However