THE SCHOOL AND THE TEACHER: CHANGES IN STUDENT PERCEPTION DURING THE PANDEMIC

The relationship between the learning environment and the learning behaviours has long been of interest in educational literature. When addressing the socioemotional stages, Erickson raises awareness of the psycho-social influence of school by way of diligence vs inferiority (Harwood et al., 2010), while Galos and Aldridge (2020) explore how designing a learning environment focused on student self-efficacy triggers statistically significant differences in 4 (out of 9) areas of analysis: fairness, task clarity, learning responsibility and task achievement. The aim of the present study is to highlight the significance and the differences in the main student psychosocial representations of school and teachers before and during the pandemic, the latter being characterised by government-imposed restrictions as well as changes in the student-teacher interaction, both during the second school term of 2019-2020 and the two school terms of the academic year 2020-2021. The areas we intend to explore are: overall attitude to school and student emotional states, the perception on teacher and peer relations, the perception on school as an organisation but also as a learning environment, the parents as a filter on schoolrelated perceptions, and the projective dimension on school life. The resulting statistical analysis (both nonparametric tests for independent groups and correlation) reveals major changes in the student perception on school and teachers, which will require systematic future intervention, as well as an upgrade of educational strategies, considering that the approaches designed and applied during the pandemic proved unable to compensate for the changes brought about by the restrictions on learning.

Complete Cohomology for Extriangulated Categories

Let [Formula: see text] be an extriangulated category with a proper class [Formula: see text] of [Formula: see text]-triangles. We study complete cohomology of objects in [Formula: see text] by applying [Formula: see text]-projective resolutions and [Formula: see text]-injective coresolutions constructed in [Formula: see text]. Vanishing of complete cohomology detects objects with finite [Formula: see text]-projective dimension and finite [Formula: see text]-injective dimension. As a consequence, we obtain some criteria for the validity of the Wakamatsu tilting conjecture and give a necessary and sufficient condition for a virtually Gorenstein algebra to be Gorenstein. Moreover, we give a general technique for computing complete cohomology of objects with finite [Formula: see text]-[Formula: see text]projective dimension. As an application, the relations between [Formula: see text]-projective dimension and [Formula: see text]-[Formula: see text]projective dimension for objects in [Formula: see text] are given.

Relative Gorenstein Dimensions over Triangular Matrix Rings

Let A and B be rings, U a (B,A)-bimodule, and T=A0UB the triangular matrix ring. In this paper, several notions in relative Gorenstein algebra over a triangular matrix ring are investigated. We first study how to construct w-tilting (tilting, semidualizing) over T using the corresponding ones over A and B. We show that when U is relative (weakly) compatible, we are able to describe the structure of GC-projective modules over T. As an application, we study when a morphism in T-Mod is a special GCP(T)-precover and when the class GCP(T) is a special precovering class. In addition, we study the relative global dimension of T. In some cases, we show that it can be computed from the relative global dimensions of A and B. We end the paper with a counterexample to a result that characterizes when a T-module has a finite projective dimension.

K-theory of n-coherent rings

Let [Formula: see text] be a strong [Formula: see text]-coherent ring such that each finitely [Formula: see text]-presented [Formula: see text]-module has finite projective dimension. We consider [Formula: see text] the full subcategory of [Formula: see text]-Mod of finitely [Formula: see text]-presented modules. We prove that [Formula: see text] is an exact category, [Formula: see text] for every [Formula: see text] and we obtain an expression of [Formula: see text].

Gorenstein-Projective Modules over Morita Rings

Let [Formula: see text] be a Morita ring which is an Artin algebra. In this paper we investigate the relations between the Gorenstein-projective modules over a Morita ring [Formula: see text] and the algebras [Formula: see text] and [Formula: see text]. We prove that if [Formula: see text] is a Gorenstein algebra and both [Formula: see text] and [Formula: see text] (resp., both [Formula: see text] and [Formula: see text]) have finite projective dimension, then [Formula: see text] (resp., [Formula: see text]) is a Gorenstein algebra. We also discuss when the CM-freeness and the CM-finiteness of a Morita ring [Formula: see text] is inherited by the algebras [Formula: see text] and [Formula: see text].

Relative global Gorenstein dimensions

Let [Formula: see text] be an abelian category. In this paper, we investigate the global [Formula: see text]-Gorenstein projective dimension [Formula: see text], associated to a GP-admissible pair [Formula: see text]. We give homological conditions over [Formula: see text] that characterize it. Moreover, given a GI-admissible pair [Formula: see text], we study conditions under which [Formula: see text] and [Formula: see text] are the same.