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CIIM 2024 Problem 2

  • Day 1

Sea nn un entero positivo y sea MnM_n el conjunto de matrices invertibles, con entradas enteras y tamaño n×nn \times n.

a) Hallar el mayor valor posible de nn tal que existe una matriz simétrica A∈MnA \in M_n que satisface:

det⁡(A20+A24)<2024.\det(A^{20} + A^{24}) < 2024.

b) Demostrar que para todo nn existe una matriz B∈MnB \in M_n tal que:

det⁡(B20+B24)<2024.\det(B^{20} + B^{24}) < 2024.

Official text Iberoamerican Interuniversity Mathematics Competition 2024 official paper, page 1. Quoted with source.

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