Rima, Zerrouki2023-07-062023-07-062023-06-10http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/40068The Spectrum of a linear operator is one of the most useful objects in functional analysis . In the case of a Banach space, there are many works with results and its importance has led many researchers to try and extend this concept to Non-Archimedean Banach space.enNon-Archimedean Banach space, Bounded linear operator , Spectrum, Fredholm operator.Thesis