Mathematician:John Leech

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English mathematician working in number theory, geometry and combinatorial group theory.

Discovered the $3$rd Hardy-Ramanujan number $\map {\operatorname{Ta} } 3$ in $1957$.

Best known for his discovery of the Leech lattice in $1965$.




  • Born: 21 July 1926 in Weybridge, Surrey, England
  • Died: 28 September 1992 in the SS Waverley, at sea between Rothesay and Largs, Scotland

As reported on his MacTutor biography page:

One of the most avid supporters of the preservation of the paddle steamer Waverley, John Leech ... collapsed and died on board the ship during the final cruise of the season. ... He was standing between the funnels on the return leg ... between Rothsay and Largs when he suffered a heart attack. As the steamer made its way back up river to Glasgow, the red Ensign was lowered to half mast as a tribute...

Theorems and Definitions

Definitions of concepts named for John Leech can be found here.


  • 1956: On the Representation of $1, 2, \ldots, n$ by Differences (J. London Math. Soc. Vol. 31: pp. 160 – 169)
  • 1957: Some Solutions of Diophantine Equations (Proc. Camb. Phil. Soc. Vol. 53: pp. 778 – 780)