Interlinguistics of interlinguistics are, however, not so constructive, but rather descriptive, comparative, historic, sociolinguistic, or concerned with translation by humans or machines. As for Esperanto, which is the most widely used constructed interlanguage, there is a relatively abundant literature about the language itself and its philology (see Esperantology). Only a few of the many constructed languages have been applied practically to any noteworthy extent. The most prosperous were Volapük (1879, Johann Martin Schleyer), Esperanto (1887 Ludwik Lejzer Zamenhof), Latino sine flexione (1903, Giuseppe Peano), Ido (1907, Louis Couturat), Occidental-Interlingue (1922, Edgar de Wahl) and Interlingua (1951, IALA and Alexander Gode), with
Ludwik Dorn conflict with the Prime Minister Jarosław Kaczyński. Elected a Marshal of the Sejm on 27 April 2007, with 235 votes, after Marek Jurek's resignation. On 4 November 2011 he, along with 15 other supporters of the dismissed PiS MEP Zbigniew Ziobro, left Law and Justice on ideological grounds to form a breakaway group, United Poland. Graduated with a degree in sociology from Warsaw University in 1978. Ludwik Dorn Ludwik Dorn (, born 5 June 1954 in Warsaw) is a Polish conservative politician, former Deputy Prime Minister and member of Sejm elected on 5 November 2007. He was born Ludwik Dornbaum,