Ejercicio Problem 1. Endomorphism bijectivity, kernel and i… · Matemàtiques URV Exemples 2024
Tema: Aplicacions lineals: nucli, imatge i matriu associada · Del examen Exemples (2024)
Enunciado
Problem 1. Endomorphism bijectivity, kernel and image
Let be the endomorphism defined by:
a)
Determine for which values of the real parameter the endomorphism is bijective.
b)
Find the value of for which the vector belongs to .
c)
Find the value of for which the vector belongs to .

Solución
Según los criterios oficiales de corrección
Values of d for which f_d is NOT bijective (comma-separated)
Solución: 0, 5
a. Determine for which values of the real parameter d the endomorphism f_d is bijective.
Solución: d != 0 and d != 5 / d in R \ {0, 5}
b. Find the value of d for which the vector (5, -1, 5) belongs to ker(f_d).
Solución: 0
c. Find the value of d for which the vector (-5, 1, 0) belongs to ker(f_d) cap Img(f_d).
Solución: 5
Verification of ker(f_d) and Img(f_d) membership
Solución: Condition 1 gives d = 5. For d = 5, the system x + 5y + 5z = -5, x + 5y - z = 1, x + 5y = 0 has solutions with z = -1 and x + 5y = 0, which is consistent. Thus d = 5.
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