* Introduction to Lattices and Order* is a mathematical textbook on order theory by Brian A. Davey and Hilary Priestley. It was published by the Cambridge University Press in their Cambridge Mathematical Textbooks series in 1990,

Both editions of the book have 11 chapters; in the second book they are organized with the first four providing a general reference for mathematicians and computer scientists, and the remaining seven focusing on more specialized material for logicians, topologists, and lattice theorists.^{ [4] }

The first chapter concerns partially ordered sets, with a fundamental example given by the partial functions ordered by the subset relation on their graphs, and covers fundamental concepts including top and bottom elements and upper and lower sets. These ideas lead to the second chapter, on lattices, in which every two elements (or in complete lattices, every set) has a greatest lower bound and a least upper bound. This chapter includes the construction of a lattice from the lower sets of any partial order, and the Knaster–Tarski theorem constructing a lattice from the fixed points of an order-preserving functions on a complete lattice. Chapter three concerns formal concept analysis, its construction of "concept lattices" from collections of objects and their properties, with each lattice element representing both a set of objects and a set of properties held by those objects, and the universality of this construction in forming complete lattices. The fourth of the introductory chapters concerns special classes of lattices, including modular lattices, distributive lattices, and Boolean lattices.^{ [5] }

In the second part of the book, chapter 5 concerns the theorem that every finite Boolean lattice is isomorphic to the lattice of subsets of a finite set, and (less trivially) Birkhoff's representation theorem according to which every finite distributive lattice is isomorphic to the lattice of lower sets of a finite partial order. Chapter 6 covers congruence relations on lattices. The topics in chapter 7 include closure operations and Galois connections on partial orders, and the Dedekind–MacNeille completion of a partial order into the smallest complete lattice containing it. The next two chapters concern complete partial orders, their fixed-point theorems, information systems, and their applications to denotational semantics. Chapter 10 discusses order-theoretic equivalents of the axiom of choice, including extensions of the representation theorems from chapter 5 to infinite lattices, and the final chapter discusses the representation of lattices with topological spaces, including Stone's representation theorem for Boolean algebras and the duality theory for distributive lattices.^{ [5] }

Two appendices provide background in topology needed for the final chapter, and an annotated bibliography.^{ [6] }

This book is aimed at beginning graduate students,^{ [2] } although it could also be used by advanced undergraduates.^{ [6] } Its many exercises make it suitable as a course textbook,^{ [2] }^{ [3] } and serve both to fill in details from the exposition in the book, and to provide pointers to additional topics.^{ [5] } Although some mathematical sophistication is required of its readers, the main prerequisites are discrete mathematics, abstract algebra, and group theory.^{ [2] }^{ [5] }

Writing of the first edition, reviewer Josef Niederle calls it "an excellent textbook", "up-to-date and clear".^{ [3] } Similarly, Thomas S. Blyth praises the first edition as "a well-written, satisfying, informative, and stimulating account of applications that are of great interest",^{ [1] } and in an updated review writes that the second edition is as good as the first.^{ [4] } Likewise, although Jon Cohen has some quibbles with the ordering and selection of topics (particularly the inclusion of congruences at the expense of a category-theoretic view of the subject), he concludes that the book is "a wonderful and accessible introduction to lattice theory, of equal interest to both computer scientists and mathematicians".^{ [5] }

Both Blyth and Cohen note the book's skilled use of LaTeX to create its diagrams, and its helpful descriptions of how the diagrams were made.^{ [1] }^{ [5] }

In abstract algebra, a **Boolean algebra** or **Boolean lattice** is a complemented distributive lattice. This type of algebraic structure captures essential properties of both set operations and logic operations. A Boolean algebra can be seen as a generalization of a power set algebra or a field of sets, or its elements can be viewed as generalized truth values. It is also a special case of a De Morgan algebra and a Kleene algebra.

In mathematics, **pointless topology** is an approach to topology that avoids mentioning points, and which the lattices of open sets are the primitive notions in it.

In mathematics, a **distributive lattice** is a lattice in which the operations of join and meet distribute over each other. The prototypical examples of such structures are collections of sets for which the lattice operations can be given by set union and intersection. Indeed, these lattices of sets describe the scenery completely: every distributive lattice is—up to isomorphism—given as such a lattice of sets.

In mathematics, the **Boolean prime ideal theorem** states that ideals in a Boolean algebra can be extended to prime ideals. A variation of this statement for filters on sets is known as the ultrafilter lemma. Other theorems are obtained by considering different mathematical structures with appropriate notions of ideals, for example, rings and prime ideals, or distributive lattices and *maximal* ideals. This article focuses on prime ideal theorems from order theory.

**Order theory** is a branch of mathematics which investigates the intuitive notion of order using binary relations. It provides a formal framework for describing statements such as "this is less than that" or "this precedes that". This article introduces the field and provides basic definitions. A list of order-theoretic terms can be found in the order theory glossary.

A **lattice** is an abstract structure studied in the mathematical subdisciplines of order theory and abstract algebra. It consists of a partially ordered set in which every two elements have a unique supremum and a unique infimum. An example is given by the natural numbers, partially ordered by divisibility, for which the unique supremum is the least common multiple and the unique infimum is the greatest common divisor.

In mathematical order theory, an **ideal** is a special subset of a partially ordered set (poset). Although this term historically was derived from the notion of a ring ideal of abstract algebra, it has subsequently been generalized to a different notion. Ideals are of great importance for many constructions in order and lattice theory.

In mathematics, an **antimatroid** is a formal system that describes processes in which a set is built up by including elements one at a time, and in which an element, once available for inclusion, remains available until it is included. Antimatroids are commonly axiomatized in two equivalent ways, either as a set system modeling the possible states of such a process, or as a formal language modeling the different sequences in which elements may be included. Dilworth (1940) was the first to study antimatroids, using yet another axiomatization based on lattice theory, and they have been frequently rediscovered in other contexts.

In mathematics, a **representation theorem** is a theorem that states that every abstract structure with certain properties is isomorphic to another structure.

Boolean algebra is a mathematically rich branch of abstract algebra. Just as group theory deals with groups, and linear algebra with vector spaces, Boolean algebras are models of the equational theory of the two values 0 and 1. Common to Boolean algebras, groups, and vector spaces is the notion of an algebraic structure, a set closed under zero or more operations satisfying certain equations.

In mathematics, the **congruence lattice problem** asks whether every algebraic distributive lattice is isomorphic to the congruence lattice of some other lattice. The problem was posed by Robert P. Dilworth, and for many years it was one of the most famous and long-standing open problems in lattice theory; it had a deep impact on the development of lattice theory itself. The conjecture that every distributive lattice is a congruence lattice is true for all distributive lattices with at most ℵ_{1} compact elements, but F. Wehrung provided a counterexample for distributive lattices with ℵ_{2} compact elements using a construction based on Kuratowski's free set theorem.

In mathematics, specifically order theory, the **Dedekind–MacNeille completion** of a partially ordered set is the smallest complete lattice that contains it. It is named after Holbrook Mann MacNeille whose 1937 paper first defined and constructed it, and after Richard Dedekind because its construction generalizes the Dedekind cuts used by Dedekind to construct the real numbers from the rational numbers. It is also called the **completion by cuts** or **normal completion**.

In the branch of mathematics known as universal algebra, a **subdirectly irreducible algebra** is an algebra that cannot be factored as a subdirect product of "simpler" algebras. Subdirectly irreducible algebras play a somewhat analogous role in algebra to primes in number theory.

In mathematics, **Birkhoff's representation theorem** for distributive lattices states that the elements of any finite distributive lattice can be represented as finite sets, in such a way that the lattice operations correspond to unions and intersections of sets. The theorem can be interpreted as providing a one-to-one correspondence between distributive lattices and partial orders, between quasi-ordinal knowledge spaces and preorders, or between finite topological spaces and preorders. It is named after Garrett Birkhoff, who published a proof of it in 1937.

**Hilary Ann Priestley** is a British mathematician. She is a professor at the University of Oxford and a Fellow of St Anne's College, Oxford, where she has been Tutor in Mathematics since 1972.

In mathematics, particularly in order theory, a **pseudocomplement** is one generalization of the notion of complement. In a lattice *L* with bottom element 0, an element *x* ∈ *L* is said to have a *pseudocomplement* if there exists a greatest element *x** ∈ *L*, disjoint from *x*, with the property that *x* ∧ *x** = 0. More formally, *x** = max{ *y* ∈ *L* | *x* ∧ *y* = 0 }. The lattice *L* itself is called a **pseudocomplemented lattice** if every element of *L* is pseudocomplemented. Every pseudocomplemented lattice is necessarily bounded, i.e. it has a 1 as well. Since the pseudocomplement is unique by definition, a pseudocomplemented lattice can be endowed with a unary operation * mapping every element to its pseudocomplement; this structure is sometimes called a ** p-algebra**. However this latter term may have other meanings in other areas of mathematics.

* Combinatorics of Finite Geometries* is an undergraduate mathematics textbook on finite geometry by Lynn Batten. It was published by Cambridge University Press in 1986 with a second edition in 1997 (ISBN 0-521-59014-0).

* Computing the Continuous Discretely: Integer-Point Enumeration in Polyhedra* is an undergraduate-level textbook in geometry, on the interplay between the volume of convex polytopes and the number of lattice points they contain. It was written by Matthias Beck and Sinai Robins, and published in 2007 by Springer-Verlag in their Undergraduate Texts in Mathematics series. A second edition was published in 2015, and a German translation of the first edition by Kord Eickmeyer,

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*Introduction to Lattices and Order*(1st ed.)",*zbMATH*, Zbl 0701.06001 - 1 2 3 4 Blyth, T. S. (2003), "Review of
*Introduction to Lattices and Order*(2nd ed.)",*Mathematical Reviews*, MR 1902334 - 1 2 3 4 5 6 7 Cohen, Jonathan (March 2007), "Review of
*Introduction to Lattices and Order*(2nd ed.)" (PDF),*ACM SIGACT News*,**38**(1): 17–23, doi:10.1145/1233481.1233488 - 1 2 3 4 Slavík, Václav, "Review of
*Introduction to Lattices and Order*(2nd ed.)",*zbMATH*, Zbl 1002.06001 - ↑ "Introduction to Lattices and Order",
*MAA Reviews*(index page only, no review), Mathematical Association of America, retrieved 2021-07-28

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