Archie Stirling Scotland and England. His sister Hannah is married to Robert Michael James Gascoyne-Cecil, 7th Marquess of Salisbury. Stirling's first wife was Charmian Rachel Montagu Douglas Scott (18 July 1942 – 5 April 2009). They married on 11 November 1964 and were divorced in 1977. She was the niece of Princess Alice, Duchess of Gloucester and the granddaughter of John Montagu Douglas Scott, 7th Duke of Buccleuch. The couple had two sons, William Rory Alexander Stirling, born on 15 December 1965, and Ludovic David Stirling, born on 29 April 1967. Stirling was married to actress Dame Diana Rigg for eight years,
Stirling numbers of the second kind Stirling numbers of the second kind In mathematics, particularly in combinatorics, a Stirling number of the second kind (or Stirling partition number) is the number of ways to partition a set of "n" objects into "k" non-empty subsets and is denoted by formula_1 or formula_2. Stirling numbers of the second kind occur in the field of mathematics called combinatorics and the study of partitions. Stirling numbers of the second kind are one of two kinds of Stirling numbers, the other kind being called Stirling numbers of the first kind (or Stirling cycle numbers). Mutually inverse (finite or infinite) triangular matrices