Notes on Number Theory

This paper presents a set of survey-style notes linking core themes of pure algebra with central topics in algebraic and analytic number theory. We begin with finite extensions of Q and describe algebraic number fields through their realization as finite-dimensional Q-algebras (via multiplication operators and matrix representations), leading naturally to the arithmetic invariants trace, norm, and discriminant, and to the ring of integers, ideals, Dedekind domains, and the ideal class group. We then develop the classical theory of cyclotomic fields, emphasizing their Galois structure and their role in abelian extensions of Q. Next, we discuss ramification in general extensions, including decomposition and inertia groups, Frobenius element and the Chebotarev density theorem. The exposition continues with a concise algebraic introduction to elliptic curves and their L-functions, and it places key conjectural links (including Birch and Swinnerton-Dyer) in context. Finally, a collection of examples highlights a common operational backbone between fractional calculus and number theory: Laplace and Mellin transforms turn convolution-type operators into multiplication, clarifying the appearance of Γ-factors, Dirichlet series, and zeta/L-function structures in both settings.