Orthogonality relations refer to the mathematical conditions that express how certain functions or representations are mutually perpendicular in a specific inner product space. In the context of character theory, these relations demonstrate how characters of irreducible representations of a finite group behave, particularly highlighting that distinct irreducible characters are orthogonal to each other under a certain inner product defined by group elements.
congrats on reading the definition of Orthogonality Relations. now let's actually learn it.