1. Letters

   • Gordon Fisher

   Department Pages: 2 - 2

2. News

   • Tony Crilly
   • William C. Waterhouse
   • Else Høyrup

   Department Pages: 3 - 5

3. Euclidean number fields 1

   • Hendrik W. Lenstra
   • A. J. van der Poorten

   Article Pages: 6 - 15

4. How Convincing is a Proof?

   Report and dialogue Pages: 17 - 18

5. Proofs

   • B. H. Neumann

   Report and dialogue Pages: 18 - 19

6. What does logic have to tell us about mathematical proofs?

   • Solomon Feferman
   • S. Feferman

   Report and dialogue Pages: 20 - 24

7. Noteworthy

   Department Pages: 26 - 28

8. News

   • David Singmaster

   Department Pages: 29 - 30

9. Pentaplexity A Class of Non-Periodic Tilings of the Plane

   • R. Penrose

   Article Pages: 32 - 37

10. A Mathematical Visit to Hanoi

    • Neal Koblitz

    Report and dialogue Pages: 38 - 42

11. Combinatorial Group Theory by Roger C. Lyndon, Paul E. Schupp

    • B. H. Neumann

    BookReview Pages: 42 - 42

12. The Dirichlet Problem

    • Lars Gårding

    Article Pages: 43 - 53

13. The calculus of leibniz — an alternative modern approach

    • David Tall

    Article Pages: 54 - 55

14. Sagacity theory: A critique

    • Hectoring J. Fussbudget
    • Rueful S. Znarler

    The olb intelligencer Pages: 56 - 59

15. Who has a photo of lamé?

    The olb intelligencer Pages: 60 - 60