Some generalizations of unbounded order convergence types in Riesz spaces and related topics

One of the main aim of this thesis is to generalize the the notion of multi-normed spaces to multi-pseudonormed spaces by replacing seminorms with pseudoseminorms and the fundemental properties of this generalized space were investigated and the notion of continuous operators between multi-pseudonormed spaces was elaborated. The other main thing is defined unbounded locally solid Riesz space and investigate its fundamental properties. In the Rest of the thesis, apart from the generalizations, we focused on the problem if topological space structure can be characterized in some real-valued maps; the answer is affirmative : 0-1-valued quasimetrics and we reproves that if an inequality is valid in reals then it is valid in any Riesz space(need not to be Archimedean) without using Kakutani Representation theorem.