Linked from
The 17 pages that link to Minimal polynomial, each with the reason it gives.
Field extensionRelated: Its degree measures the extension generated by that element.
Jordan normal formRelated: Its root multiplicities give the largest block size for each eigenvalue.
Algebraic integerRelated: Its coefficients show whether an algebraic number is an algebraic integer.
Transcendence theoryRelated: Its existence for algebraic numbers contrasts with transcendence.
Gelfond–Schneider theoremRelated: It encodes the algebraic nature of the base and exponent.