Every finite lattice can be embedded in a finite partition lattice

Conclusions There are many questions, which arise in connection with the theorem presented. In general, we would like to know more about the class of embeddings of a given lattice in the lattices of all equivalences over finite sets. Some of these problems are studied in 4]. In this paper, an embedding is called normal, if it preserves 0 and 1. Using regraphs, our result can be easily improved as follows: THEOREM.For every lattice L, there exists a positive integer n ₀,such that for every n≥n ₀,there is a normal embedding π: L→Eq(A), where |A|=n. Embedding satisfying special properties are shown in Lemma 3.2 and Basic Lemma 6.2. We hope that our method of regraph powers will produce other interesting results. There is also a question about the effectiveness of finding an embedding of a given lattice. In particular, the proof presented here cannot be directly used to solve the following. Problem. Can the dual of Eq(4) be embedded into Eq(2¹⁰⁰⁰)? Presented by G. Gr?tzer.