Non-Euclidean geometry caused a re-examination of the teaching of geometry based on Euclid's Elements. This curriculum issue was hotly debated at the time and was even the subject of a book, "Euclid and his Modern Rivals", written by Charles Lutwidge Dodgson (1832–1898) better known as Lewis Carroll, the author of "Alice in Wonderland". In analytic geometry a plane is described with Cartesian coordinates : "C" = { ("x,y") : "x", "y" ∈ ℝ }. The points are sometimes identified with complex numbers where ε ∈ { –1, 0, 1}. The Euclidean plane corresponds to the case since the modulus of is given
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