modular lattices; prime quotients; order-dense quotients; valuation; discrete valuation
It is well-known that there exist infinite modular lattices possessing no non-trivial valuations. In this paper a class $\Cal K$ of modular lattices is defined and it is proved that each lattice belonging to $\Cal K$ has a nontrivial valuation. Next, a result of $G$. Birkhoff concerning valuations on modular lattices of finite length is generalized.
 G. Grätzer: General Lattice Theory
. Akademie Verlag, Berlin, 1978. MR 0504338
 E. T. Schmidt: Über die Kongruenzverbände der Verbände
. Publ. Math. Debrecen 9 (1962), 245-256. MR 0151405
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