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CIIM 2022 Problem 5

  • Day 2

Se define en el plano la sucesión de vectores v1,v2,…v_1, v_2, \ldots, mediante los valores iniciales v1=(1,0)v_1 = (1, 0), v2=(−1/2,1/2)v_2 = (-1/\sqrt{2}, 1/\sqrt{2}) y la relación

vn=vn−1+vn−2∥vn−1+vn−2∥,v_n = \frac{v_{n-1} + v_{n-2}}{\|v_{n-1} + v_{n-2}\|},

para n≥3n \geq 3. Demostrar que la sucesión es convergente y determinar su límite.

Nota: La expresión ∥v∥\|v\| denota la longitud del vector vv.

Official text Iberoamerican Interuniversity Mathematics Competition 2022 official paper, page 1. Quoted with source.

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