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
Mark Dodgson (1730-1795). Mark Dodgson Mark Dodgson (born 1 May 1957) is an Australian academic and author. His research on the innovation process has influenced innovation management and policy worldwide. Born in Norwich, UK, he grew up in Wales and Uganda, where his father was pilot to Presidents Milton Obote and Idi Amin. He is the brother of author, Philip Pullman. After a number of years working as a lorry driver and drayman in London, Dodgson completed his PhD in two years at Imperial College London and worked at the Science Policy Research Unit at University of Sussex for eight years. During