Shafaat, Ahmad2017-11-062017-11-061968b1015858http://hdl.handle.net/1885/133216The concepts , remarks and results presented in this thesis are in four distinct directions in Model Theory and Universal Algebra , Since every chapter has a detailed introductory part of its own, in this introduction we shall only make very brief remarks to point out to the directions taken up in the present work.106 lenAlgebra, UniversalModel theory196810.25911/5d723b09b9e232017-10-23