By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative sign pattern A is said to allow normality if there is a normal matrix B whose entries have signs indicated by A. In this paper the combinatorial structure of nonnegative normal matrices, in particular, (0, 1) normal matrices, is investigated. Among other results, up to order 5, (0, 1) normal matrices are classified up to permutation similarity. A number of general conditions for sign patterns to allow normality are obtained. Some interesting constructions of nonnegative normal matrices are provided. In particular, a number of bordering results are obtained. Some open problems are also indicated
AbstractA sign pattern matrix is a matrix whose entries are from the set {+, −, 0}. For a real matri...
AbstractIn this paper, we modify Eschenbach’s algorithm for constructing sign idempotent sign patter...
AbstractA nonnegative sign pattern matrix is a matrix whose entries are from the set {+,0}. A nonneg...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
AbstractBy a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonn...
AbstractBy a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonn...
AbstractA nonnegative sign pattern matrix is a matrix whose entries are from the set {+,0}. A nonneg...
AbstractWe determine here the +, -,0 sign patterns which occur among the inverses of nonsingular, en...
AbstractA result of Johnson, Leighton, and Robinson characterizing sign patterns of real matrices wi...
AbstractWe determine here the +, -,0 sign patterns which occur among the inverses of nonsingular, en...
AbstractWe identify the sign patterns which occur among the real, nonsingular, entrywise nonzero mat...
An m by n sign pattern S is an m by n matrix with entries in {+,-, 0}. Such a sign pattern allows a ...
AbstractIf A is an n × n sign pattern matrix, then Q(A) denotes the set of all real n×n matrices B s...
AbstractA sign pattern matrix is a matrix whose entries are from the set {+, −, 0}. For a real matri...
AbstractIn this paper, we modify Eschenbach’s algorithm for constructing sign idempotent sign patter...
AbstractA nonnegative sign pattern matrix is a matrix whose entries are from the set {+,0}. A nonneg...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
By a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonnegative ...
AbstractBy a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonn...
AbstractBy a nonnegative sign pattern we mean a matrix whose entries are from the set {+, 0}. A nonn...
AbstractA nonnegative sign pattern matrix is a matrix whose entries are from the set {+,0}. A nonneg...
AbstractWe determine here the +, -,0 sign patterns which occur among the inverses of nonsingular, en...
AbstractA result of Johnson, Leighton, and Robinson characterizing sign patterns of real matrices wi...
AbstractWe determine here the +, -,0 sign patterns which occur among the inverses of nonsingular, en...
AbstractWe identify the sign patterns which occur among the real, nonsingular, entrywise nonzero mat...
An m by n sign pattern S is an m by n matrix with entries in {+,-, 0}. Such a sign pattern allows a ...
AbstractIf A is an n × n sign pattern matrix, then Q(A) denotes the set of all real n×n matrices B s...
AbstractA sign pattern matrix is a matrix whose entries are from the set {+, −, 0}. For a real matri...
AbstractIn this paper, we modify Eschenbach’s algorithm for constructing sign idempotent sign patter...
AbstractA nonnegative sign pattern matrix is a matrix whose entries are from the set {+,0}. A nonneg...