The non-recursive formula for Fibonacci numbers

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The Fibonacci sequence has a closed-form formula expressed using the golden ratio and its conjugate, avoiding expensive recursive computation. Two mathematical approaches derive this formula: generating functions (treating sequences as power series coefficients) and eigenvalue decomposition of the Fibonacci matrix. Both methods reveal why the golden ratio appears in Fibonacci numbers and demonstrate how calculus, algebra, and combinatorics intersect to create powerful computational tools.

Why is the Golden Ratio Hiding in the Fibonacci Sequence?