### Volume 18 (1990)

**Volume 18 Issue 1 (Year 1990)**

- The Icosahedron (Michael Atiyah)
- Uncertainty and sequential choice (John A Bather)
- Introduction to robust statistics (Xuming He)
- An investigation into the mathematical theory behind check-digits for the purpose of error-detection (Ng Weng Leng)
- Problems and solutions
- Annual report 1989
- Announcement

**Volume 18 Issue 2 (Year 1990)**

- An overview of classical integration theory (Ma Zheng Min, Lee Peng Yee)
- A geometrical figure associated with the cycle of sixty years (John Rigby)
- Theoretical computers and diophantine equations (Alvin Chan, KJ Mourad)
- Problems and Solutions
- Interschool mathematical competition 1990 – problems & solutions
- The 31st International Mathematical Olympiad (YK Leong)
- Index to Volume 18