Release 20240825-1429

book: #215 Fix description about mtime and mtimecmp in ch3-4

Release 20240709-1547

replace chinese characters in math env, due to the lack of CJK suppor…

…t in sphinx->latex output

Release 20240709-1522

Merge pull request #205 from jiangshengdev/ci-pdf

feat(ci): add GitHub Actions workflow for PDF generation

build 20230406

3.6.0-alpha.1

Add pdf guide