### Volume 9 (1981)

**Volume 09 Issue 1 (Year 1981)**

- Evolution of the notion of magnitude (Maurice Sion)
- Hausdorff’s paradox – or two for one (EC Milner)
- Normal subgroups and factor groups (TA Peng)
- Inter-school mathematical competition 1981
- Results of Inter-school mathematical competition 1981
- Solutions of problems

**Volume 09 Issue 2 (Year 1981)**

- Some amazing properties of the function f(x) = x2 (DM Goldschmidt)
- The essence of mathematical logic (Gerald E Sacks)
- Hilbert’s tenth problem (CT Chong)
- News and activities of the Society
- Annual report 1980
- Index to Volume 9