Dodgson's method of swaps needed to make him a winner) is an NP-complete problem by reduction from Exact Cover by 3-Sets (X3C). Dodgson's method Dodgson's method is an electoral system proposed by the author, mathematician and logician Charles Dodgson, better known as Lewis Carroll. The method is to extend the Condorcet method by swapping candidates until a Condorcet winner is found. The winner is the candidate which requires the minimum number of swaps. Dodgson proposed this voting scheme in his 1876 work "A method of taking votes on more than two issues". Given an integer "k" and an election, it is NP-complete
George Dodgson Callow 1863 and "Coastal Scene, Isle of Wight" in 1864. He appears to have specialised in landscapes and maritime painting. He was married to Katherine Elston in 1866. The couple are not known to have had any children. He died in 1875. His work is included in a number of public collections in the United Kingdom, including Middlesbrough Institute of Modern Art and Brighton and Hove Museum and Art Gallery. George Dodgson Callow George Dodgson Callow (1829–1875) was an English painter who specialized in landscapes and maritime water color painting. Callow was born in Liverpool in 1829; according to the Parish