This study aims to combine the generalized Tribonacci sequence with 3-parameter quaternions to construct a new mathematical structure: generalized Tribonacci 3-parameter generalized quaternions (3PGQs), in order to expand the application scope of quaternion algebra. To achieve this, this special numerical system was explored in detail, and a series of new equations and well-known classical identities were derived, including Binet’s formula, generating functions, exponential generating functions, Poisson generating functions, summation formulas, Cassini identity, polar coordinate representations, and matrix formulas, etc. In addition, the study introduced content closely related to the matrix representation of generalized Tribonacci 3PGQs, such as determinants, characteristic polynomials, characteristic equations, eigenvalues, and eigenvectors, laying a theoretical foundation for further research in this field.
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