6,305 research outputs found
Weakly spectrally complete pair of matrices
Let and be matrices over an algebraically closed field. Let be elements of such that and . We give necessary and sufficient condition for the existence of matrices and similar to and, respectively, such that has eigenvalues
Embedding a regular subpencil into a general linear pencil
AbstractWe study the possible strictly equivalence classes of a pencil when a regular subpencil is prescribed. We also study the possible invariant polynomials and the possible characteristic polynomials of A+BY+XC+XDY when X and Y vary
Completion problems for real matrices, II
Thirty years ago, G.N. de Oliveira has proposed the following completion problems: Describe the possible characteristic polynomials of [C-ij], i,j is an element of {1, 2}, where C-1,C-1 and C-2,C-2 are square submatrices, when some of the blocks C-ij are fixed and the others vary. Several of these problems remain unsolved. This paper gives the solution, over the field of real numbers, of Oliveira's problem where the blocks C-1,C-1, C-2,C-2 are fixed and the others vary
Why are some prices stickier than others? Firm-data evidence on price adjustment lags
Infrequent price changes at the firm level are now well documented in the literature. However, a number of issues remain partly unaddressed. This paper contributes to the literature on price stickiness by investigating the lags of price adjustments to different types of shocks. We find that adjustment lags to cost and demand shocks vary with firm characteristics, namely the firm’s cost structure, the type of pricing policy, and the type of good. We also document that firms react asymmetrically to demand and cost shocks, as well as to positive and negative shocks, and that the degree and direction of the asymmetry varies across firms. JEL Classification: C41, D40, E31Firm heterogeneity, Panel-ordered probit, real rigidities, survey data
Estratégia h-adaptativa para a análise elasto-plástica bidimensional
Neste trabalho apresenta-se uma estratĂ©gia h-adaptativa para problemas de elasticidade bidimensional, discretizados por elementos finitos triangulares lineares, considerando a nao linearidade do material. Esta estratĂ©gia Ă© baseada na tĂ©cnica de remalhamento (remeshing) onde, atravĂ©s de estimativa de erro a posteriori, se prediz o tamanho do elemento necessário para atingir um nĂvel de precisao prĂ©-especificado. O comportamento nao linear do material Ă© tratado atravĂ©s do modelo de subcamadas, nao se limitando portanto a modelos bilineares.Peer Reviewe
Estratégia h-adaptativa para a análise elasto-plástica bidimensional
Neste trabalho apresenta-se uma estratĂ©gia h-adaptativa para problemas de elasticidade bidimensional, discretizados por elementos finitos triangulares lineares, considerando a nao linearidade do material. Esta estratĂ©gia Ă© baseada na tĂ©cnica de remalhamento (remeshing) onde, atravĂ©s de estimativa de erro a posteriori, se prediz o tamanho do elemento necessário para atingir um nĂvel de precisao prĂ©-especificado. O comportamento nao linear do material Ă© tratado atravĂ©s do modelo de subcamadas, nao se limitando portanto a modelos bilineares.Peer Reviewe
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