1. Mathematical intelligencer news: Online edition, electronic submission

   • Chandler Davis
   • Majorie Senechal

   EditorialNotes 25 April 2009 Pages: 3 - 3

2. Non-Euclidean pythagorean triples, a problem of euler, and rational points on K3 surfaces

   • Robin Hartshorne
   • Ronald Van Luijk

   Article 25 April 2009 Pages: 4 - 10

3. Erratum to: Max von laue’s role in the relativity revolution

   • David E. Rowe

   Erratum 25 April 2009 Pages: 10 - 10

4. A subprime lending market primer

   • Colin Adams

   Department 25 April 2009 Pages: 12 - 13

5. The geometry of paradise

   • Mark A. Peterson

   Department 25 April 2009 Pages: 14 - 19

6. An introduction to infinite hat problems

   • Christopher S. Hardin
   • Alan D. Taylor

   Article 25 April 2009 Pages: 20 - 25

7. Sub shoot!

   • Michael Kleber

   Department 25 April 2009 Pages: 26 - 30

8. Stefan Banach remembered in Krakow

   • Danuta Ciesielska
   • Krzysztof Ciesielski

   Department 25 April 2009 Pages: 31 - 35

9. The double life of Felix Hausdorff/ Paul Mongré

   • Walter Purkert

   Department 25 April 2009 Pages: 36 - 50

10. Julia sets that are full of holes

    • Kimberly A. Roth

    Article 25 April 2009 Pages: 51 - 56

11. The architecture of modern mathematics

    • Andrew Arana

    Review 25 April 2009 Pages: 57 - 61

12. Leonhard Euler. Ein mann, mit dem man Rechnen Kann

    • Johan Sten

    Review 25 April 2009 Pages: 61 - 62

13. Graßmann (Vita mathematica)

    • Gert Schubring

    Review 25 April 2009 Pages: 62 - 64

14. Arthur Cayley mathematician laureate of the victorian age

    • Henry E. Heatherly

    Review 25 April 2009 Pages: 64 - 67

15. Helmut Hasse und Emmy Noether. Die korrespondenz 1925–1935

    • Winfried Scharlau

    Review 25 April 2009 Pages: 67 - 68

16. Two cultures: Essays in honour of David Speiser

    • Amir Alexander

    Review 25 April 2009 Pages: 68 - 70

17. Mathematics and the divine. A historical study

    • Jean-Michel Kantor

    Review 25 April 2009 Pages: 70 - 71

18. Nonplussed! mathematical proof of implausible ideas

    • Christina Birkenhake

    Review 25 April 2009 Pages: 71 - 72

19. The philamath’s alphabet—S

    • Robin Wilson

    Announcement 25 April 2009 Pages: 88 - 88