The climatic perturbations would show drastic effect across the world and hence are
anticipated to boom in the near future. The effects of climate change can't be denied and has …

Let T be a weak torsion class of left R-modules and na positive integer. A left R-module M is
called (T, n)-injective if Ext R n (C, M)= 0 for each (T, n+ 1)-presented left R-module C; a right …

Let R be a ring, τ= T, ℱ a hereditary torsion theory of mod-R, and na positive integer. Then, R
is called right τ-n-coherent if every n-presented right R-module is τ, n+ 1-presented. We …