Ivan Rival

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Holes in ordered sets

Peter Nevermann, Ivan Rival, I. Rival, 1985, Graphs Comb..

Upward Drawings on Planes and Speres

Andrzej Kisielewicz, S. Mehdi Hashemi, Ivan Rival, 1995, Graph Drawing.

Series-Parallel Planar Ordered Sets Have Pagenumber Two

Ivan Rival, Mohammad Alzohairi, I. Rival, 1996, GD.

Light sources, obstructions and spherical orders

Jorge Urrutia, Stephan Foldes, Ivan Rival, 1992, Discret. Math..

Enumerating orientations of ordered sets

Wei-Ping Liu, Ivan Rival, 1991, Discret. Math..

Is there a diagram invariant?

Maurice Pouzet, Ivan Rival, 1989, Discret. Math..

Bipartite Graphs, Upward Drawings, and Planarity

Giuseppe Di Battista, Wei-Ping Liu, Ivan Rival, 1990, Inf. Process. Lett..

Path length in the covering graph of a lattice

Dwight Duffus, Ivan Rival, I. Rival, 1977, Discret. Math..

Greedy linear extensions with constraints

Nejib Zaguia, Ivan Rival, 1987, Discret. Math..

Combinatorics and ordered sets : proceedings of the AMS-IMS-SIAM Joint Summer Research Conference, held August 11-17, 1985, with support from the National Science Foundation

Ivan Rival, 1986 .

A note on fixed points in semimodular lattices

Anders Björner, Ivan Rival, 1980, Discret. Math..

Automorphisms, isotone self-maps and cycle-free orders

Nejib Zaguia, Wei-Ping Liu, Ivan Rival, 1995, Discret. Math..

Certain Partially Ordered Sets of Dimension Three

David Kelly, Ivan Rival, David Kelly, 1975, J. Comb. Theory, Ser. A.

On a class of isometric subgraphs of a graph

Richard J. Nowakowski, Ivan Rival, 1982, Comb..

Degree Navigator™: The Journey of a Visualization Software

Nejib Zaguia, Guy-Vincent Jourdan, Ivan Rival, 2003, Graph Drawing.

Separable Subsets of a Finite Lattice

Dwight Duffus, Ivan Rival, I. Rival, 1978, J. Comb. Theory, Ser. A.

Drawing orders with few slopes

Andrzej Pelc, Jurek Czyzowicz, Ivan Rival, 1990, Discret. Math..

Linear Extensions with Backtracking

Ivan Rival, Siming Zhan, 1991, ICCI.

Complete ordered sets with no infinite antichains

Maurice Pouzet, Dwight Duffus, Ivan Rival, 1981, Discret. Math..

A Fixed Point Theorem for Finite Partially Ordered Sets

Ivan Rival, I. Rival, 1976, J. Comb. Theory, Ser. A.

Permutation Schedules for Flow Shops with Precedence Constraints

George Steiner, Ivan Rival, Kevin Ewacha, 1990, Oper. Res..

The smallest order variety containing all chains

Rudolf Wille, Ivan Rival, R. Wille, 1981, Discrete Mathematics.

Representing orders by moving figures in space

Jorge Urrutia, Ivan Rival, 1992, Discret. Math..

Retract rigid cartesian products of graphs

Richard J. Nowakowski, Ivan Rival, 1988, Discret. Math..

Spanning retracts of a partially ordered set

Miklós Simonovits, Dwight Duffus, Ivan Rival, 1980, Discret. Math..

Upward Drawings to Fit Surfaces

S. Mehdi Hashemi, Ivan Rival, 1994, ORDAL.

Problems About Planar Orders

Ivan Rival, I. Rival, 1993 .

Collecting Information in Graded Ordered Sets

Dmitry Fon-Der-Flaass, Ivan Rival, 1993, Parallel Process. Lett..

Upward Drawing on the Plane Grid Using Less Ink

Nejib Zaguia, Guy-Vincent Jourdan, Ivan Rival, 1994, GD.

Order-Preserving Maps

Ivan Rival, 1982 .

The smallest graph variety containing all paths

Richard J. Nowakowski, Ivan Rival, R. Nowakowski, 1983, Discret. Math..

Representing orders on the plane by translating points and lines

Jorge Urrutia, Richard J. Nowakowski, Ivan Rival, 1990, Discret. Appl. Math..

Fixed-edge theorem for graphs with loops

Richard J. Nowakowski, Ivan Rival, R. Nowakowski, 1979, J. Graph Theory.

Perpendicular orders

Nejib Zaguia, Ivan Rival, 1995, Discret. Math..

Galleries, Light Matchings and Visibility Graphs

Jorge Urrutia, Jurek Czyzowicz, Ivan Rival, 1989, WADS.

Orders with Level Diagrams

Andrzej Pelc, Ivan Rival, 1991, Eur. J. Comb..

Recursion and Game Theory

Ivan Rival, 1982 .

Approximating the Number of Linear Extensions

Nejib Zaguia, Ivan Rival, Kevin Ewacha, 1997, Theor. Comput. Sci..

A structure theory for ordered sets

Dwight Duffus, Ivan Rival, I. Rival, 1981, Discret. Math..

Inversions, cuts, and orientations

Wei-Ping Liu, Ivan Rival, 1991, Discret. Math..

Chains, antichains, and fibres

Zbigniew Lonc, Ivan Rival, Zbigniew Lonc, 1987, J. Comb. Theory, Ser. A.

The pagenumber of spherical lattices is unbounded

Alexandr V. Kostochka, Ivan Rival, Mohammad Alzohairi, 2001 .

Genus of Order and Lattices

Klaus Reuter, Ivan Rival, 1990, WG.

Crooked diagrams with few slopes

Andrzej Pelc, Jorge Urrutia, Jurek Czyzowicz, 1990 .

Maximal sublattices of finite distributive lattices

Ivan Rival, I. Rival, 1973 .

Linear Ectensions of Finite Ordered Sets

Ivan Rival, I. Rival, 1984 .

Distributive cover-preserving sublattices of modular lattices

Ivan Rival, Richard Nowakowski, 1978 .

Clones, order varieties, near unanimity functions and holes

Ivan Rival, I. G. Rosenberg, R. W. Quackenbush, 1990 .

Order, order, order ...

Ivan Rival, 1984 .

Lattices contained in planar orders are planar

Jorge Urrutia, Richard J. Nowakowski, Ivan Rival, 1992 .

Lattice varieties covering the smallest nonmodular variety.

Ivan Rival, Bjarni Jónsson, B. Jónsson, 1979 .

Constructing greedy linear extensions by interchanging chains

Nejib Zaguia, Ivan Rival, 1986 .

Weak embeddings and embeddings of finite distributive lattices

Ivan Rival, Bill Sands, 1975 .

Sublattices of Modular Lattices of Finite Length

Ivan Rival, 1975, Canadian Mathematical Bulletin.

Retracts of partially ordered sets

Dwight Duffus, Ivan Rival, I. Rival, 1979, Journal of the Australian Mathematical Society.

PICTURE PUZZLING: Mathematicians Are Rediscovering the Power of Pictorial Reasoning

Ivan Rival, I. Rival, 1987 .

Lattices with Doubly Irreducible Elements

Ivan Rival, 1974, Canadian Mathematical Bulletin.

Graphs orientable as distributive lattices

Dwight Duffus, Ivan Rival, 1983 .

Finite sublattices generated by order-isomorphic subsets

Werner Poguntke, Ivan Rival, I. Rival, 1974 .

Ordered sets : proceedings of the NATO Advanced Study Institute held at Banff, Canada, August 28 to September 12, 1981

Ivan Rival, I. Rival, 1982 .

A note on Whitman's property for free lattices

Ivan Rival, Rachad Antonius, 1974 .

Subdiagrams equal in number to their duals

Ivan Rival, Klaus Reuter, 1986 .

The maximal size of the covering graph of a lattice

Béla Bollobás, Ivan Rival, 1979 .

Continuous, slope-preserving maps of simple closed curves

Tibor Bisztriczky, Ivan Rival, 1980 .

Examples of Jump-Critical Ordered Sets

Ivan Rival, M. H. El-Zahar, 1985 .

A THEOREM ON FINITE SUBLATTICES OF FREE LATTICES

Werner Poguntke, Ivan Rival, 1977 .

Dimension two, fixed points and dismantlable ordered sets

Ivan Rival, Aleksander Rutkowski, Tatiana Fofanova, 1996 .

A note on the congruence lattice of a finitely generated algebra

Ivan Rival, Bill Sands, 1978 .

Quotients of complete ordered sets

Maurice Pouzet, Ivan Rival, I. Rival, 1983 .

An exchange property for modular lattices

Ivan Rival, Herbert S. Gaskill, 1978 .

A CORRECTION TO SMALL REPRESENTATIONS OF FINITE DISTRIBUTIVE LATTICES AS CONGRUENCE LATTICES

Nejib Zaguia, George Grätzer, Ivan Rival, 1998 .

Order, genus, and diagram invariance

Ivan Rival, Kevin Ewacha, I. Rival, 1991 .

A classification of reflexive graphs: the use of «holes»

Maurice Pouzet, Ivan Rival, El Moustafa Jawhari, 1986 .

Combinatorics and ordered sets

Ivan Rival, 1986 .

A note on weak embeddings of distributive lattices

Dwight Duffus, Ivan Rival, I. Rival, 1980 .

The Retract Construction

Ivan Rival, I. Rival, 1982 .

How many four-generated simple lattices

Ivan Rival, Bill Sands, 1982 .

A characterization of semi-distributivity

Brian A. Davey, Ivan Rival, W. Poguntke, 1975 .

The Complexity of Upward Drawings on Spheres

Andrzej Kisielewicz, S. Mehdi Hashemi, S. M. Hashemi, 1997 .

Diagrams, orientations, and varieties

Hans-Jürgen Bandelt, Ivan Rival, H. Bandelt, 1989 .

Planar Sublattices of a Free Lattice. I

Ivan Rival, Bill Sands, I. Rival, 1978, Canadian Journal of Mathematics.

Combinatorial inequalities for semimodular lattices of breadth two

Ivan Rival, I. Rival, 1976 .

A generalized permutahedron

Maurice Pouzet, Nejib Zaguia, Ivan Rival, 1995 .

The diagram invariant problem for planar lattices

Roland Jégou, Ivan Rival, Richard Nowakowski, 1987 .

Finite four-generated simple lattices contain all finite lattices

Werner Poguntke, Ivan Rival, 1976 .

On the ubiquity of herringbones in finitely generated lattices

Ivan Rival, Bill Sands, I. Rival, 1981 .

Exponents of lattice-ordered algebras

Brian A. Davey, Ivan Rival, B. Davey, 1982 .

The Problem of Fixed Points in Ordered Sets

Ivan Rival, 1980 .

Matroid Applications: Algebraic Aspects of Partition Lattices

Ivan Rival, Miriam Stanford, 1992 .

Dilworth’s Covering Theorem for Modular Lattices

Ivan Rival, I. Rival, 1990 .

An arithmetical theorem for modular lattices

Bernhard Ganter, Ivan Rival, B. Ganter, 1975 .

Planar ordered sets of width two

Andrzej Pelc, Jurek Czyzowicz, Ivan Rival, 1990 .

Images of simple lattice polynomials

Nejib Zaguia, Ivan Rival, N. Zaguia, 1995 .

FINITE SUBLATTICES OF THREE-GENERATED LATTICES

Brian A. Davey, Ivan Rival, 1976 .

Pictures in Lattice Theory

Ivan Rival, Bill Sands, I. Rival, 1982 .

EXPONENTS OF FINITE SIMPLE LATTICES

Brian A. Davey, Dwight Duffus, Ivan Rival, 1978 .

Critical edges in subdirectly irreducible lattices

Ivan Rival, Bjarni Jónsson, 1977 .

On the Adjacency of Vertices to the Vertices of an Infinite Subgraph

Ivan Rival, Bill Sands, 1980 .

Retracts and the Fixed Point Problem for Finite Partially Ordered Sets

Dwight Duffus, Werner Poguntke, Ivan Rival, 1980, Canadian Mathematical Bulletin.

Which ordered sets have a complete linear extension

Maurice Pouzet, Ivan Rival, 1981 .

A note on linear extensions of irreducible elements in a finite lattice

Ivan Rival, 1976 .

Every countable lattice is a retract of a direct product of chains

Maurice Pouzet, Ivan Rival, I. Rival, 1984 .

GALLERIES AND LIGHT MATCHINGS: FAT COOPERATIVE GUARDS

Jorge Urrutia, Jurek Czyzowicz, Ivan Rival, 1991 .

Every triangle-free planar graph has a planar upward drawing

Andrzej Kisielewicz, Ivan Rival, I. Rival, 1993 .

Unfolding Weighted Consensus Orders into Consistent Numerical Scales

Andrzej Pelc, Jurek Czyzowicz, Ivan Rival, 1990 .

Antichains and Finite Sets that Meet all Maximal Chains

Ivan Rival, Bill Sands, John Ginsburg, 1986, Canadian Journal of Mathematics.

The Spectrum of a Finite Lattice: Breadth and Length Techniques

Ivan Rival, Richard Nowakowski, 1977, Canadian Mathematical Bulletin.

Optimal linear extensions by interchanging chains

Ivan Rival, 1983 .

The endomorphism spectrum of an ordered set

Richard J. Nowakowski, Ivan Rival, Ken Grant, 1995 .

Dimension invariance of subdivisions

Ivan Rival, Richard Nowakowski, R. Nowakowski, 2001, Bulletin of the Australian Mathematical Society.

Lattices freely generated by partially ordered sets: which can be "drawn"?

Rudolf Wille, Ivan Rival, R. Wille, 1979 .

Structure Results for Function Lattices

Dwight Duffus, Ivan Rival, Bjarni Jónsson, 1978, Canadian Journal of Mathematics.

Crowns, Fences, and Dismantlable Lattices

Ivan Rival, David Kelly, David Kelly, 1974, Canadian Journal of Mathematics.

Dilworth’s covering theorem for modular lattices: A simple proof

Bernhard Ganter, Ivan Rival, B. Ganter, 1973 .

A Logarithmic Property for Exponents of Partially Ordered Sets

Dwight Duffus, Ivan Rival, I. Rival, 1978, Canadian Journal of Mathematics.