olymmath

CIIM 2025 Problem 3

  • Day 1

Sea EE una elipse con semiejes a>ba > b y sea BB un extremo del eje menor de la elipse. Para todo punto PP de la elipse, defina m(P)m(P) como la mayor distancia de PP a cualquier otro punto de la elipse; es decir, defina la función

m(P)=max⁡Q∈EPQ,m(P) = \max_{Q \in E} PQ,

donde PQPQ denota la distancia de PP a QQ.

a) Demuestre que m(B)≤m(P)m(B) \leq m(P) para todo punto PP de la elipse.

b) Determine el valor de m(B)m(B) en términos de aa y bb.

Official text Iberoamerican Interuniversity Mathematics Competition 2025 official paper, page 1. Quoted with source.

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