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Item A study of some common fixed point theorems for four maps in cone metric spaces(UMT Lahore, 2014) Zaheer Munawar HussainOur present work is about coincidence and common fixed points results for four mappings in a cone metric space which satisfy a new and advanced contractive condition. The functions we consider in this work are weakly compatible. It is worth mentioning that we did not assume any kind of commuting or continuity condition on the functions to review the above results. The results we studied here unified, generalized, and extended the comparable results in the existing literature.Item An extension of normalizer, centralizer, centre and automorphism of groups in soft groups(UMT Lahore, 2014) Muhammad Nadeem AhmedThe theory of soft sets, introduced by Molodtsov [13], is an extension of set theory for the study of intelligent systems characterized by insufficient and incomplete information. H. Aktas and N. C˘agman [1] studied algebraic structure on this particular set called soft groups and define the soft homomorphism. The main purpose of this thesis is to explore the knowledge about soft groups, center of soft groups, centralizer of soft groups, normalizer of soft groups, soft automorphism, soft inner automorphism and soft outer automorphism.