It has been indicated several times in this lemma that different scientists with different intentions and aims and with different backgrounds have proposed or propose equally different ideas about discrete geometry as an alternative for classical geometry. Many authors do not necessarily present more or less complete theories, but rather limit themselves to making suggestions and exploring some particular idea. These papers are to be seen as sources of inspiration in the search for a full-fledged theory. A few examples are: Hahn (1934), Biser (1941), Coish (1959), Ahmavaara (1965a,b), Finkelstein (1969) (this is the first of a five paper series with the same title in the same journal), Dadić &amp; Pisk (1979), Finkelstein &amp; Rodriguez (1986), Meessen (1989), Buot (1989), to name but a very few. For the period 1925–1936, Kragh and Carazza (1994) is an excellent overview showing that many physicists were playing around with finitist ideas.