Fröhlich's Theorem is a result in the field of mathematics, specifically in the area of number theory. It states that if a certain type of algebraic number field has a specific property, then it can be represented in a particular way using its roots. This theorem helps mathematicians understand the structure of algebraic numbers and their relationships. The theorem is named after the mathematician A. Fröhlich, who contributed significantly to algebraic number theory. Fröhlich's work has implications for various areas, including Galois theory and the study of field extensions, enhancing our understanding of how numbers can be constructed and manipulated.