lah numbers造句

• Lah numbers are related to Stirling numbers.
• "' Unsigned Lah numbers "'have an interesting meaning in combinatorics : they count the number of ways a partitioned into " k " nonempty linearly ordered subsets.
• "' Ivo Lah "'(; 5 September 1896  23 March 1979 ) was a Slovenian mathematician and actuary, best known for his discovery of the Lah numbers in 1955 and for the Lah identity.
• The second example below uses the products " v " ( " v " + 1 ) of the values of the log-matrix and constructs a 7-by-7 " Lah "-matrix ( or matrix of coefficients of Lah numbers)