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Fibonacci spiral: squares and quarter-circle arcs (like the nautilus)
21 13 8 5 3 2 1, 1, 2, 3, 5, 8, 13, 21 - each number = sum of the two before it
Fibonacci in Pascal's triangle: shallow diagonals sum to Fibonacci numbers
1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1 5 10 10 5 1 1 1 1+1=2 1+2=3 Each shallow diagonal sums to a Fibonacci number: 1, 1, 2, 3, 5, 8, 13...
Binet's formula: closed-form for Fibonacci
F(n) = (φⁿ − ψⁿ) / √5
φ = (1+√5)/2 ≈ 1.61803… ψ = (1−√5)/2 ≈ −0.61803…
Because |ψ| < 1, ψⁿ → 0. F(n) is the nearest integer to φⁿ / √5.
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