This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The gamma function extends the factorial to a continuous and complex-variable setting and provides a foundation for numerous special functions. This paper examines its basic properties, related functions, and incomplete forms before investigating selected applications to definite integration, statistical mechanics, probability theory, and fractional calculus. Particular attention is given to the conditions under which integral representations and identities are valid. Classical results are connected with recent work on series representations and Stirling-type approximations. The study emphasizes the gamma function both as an analytical object and as a unifying tool in mathematical physics.
null