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Soit . Quelles sont les assertions vraies ?
n'est pas un espace vectoriel.
est stable par multiplication par un scalaire.
est stable par addition.
La fonction nulle n'appartient pas à .
Which of the following best describes the magnetic skin effect?
A concentration in the flux density at the outer edges of the core due to effect of eddy currents.
Magnetization of the conductor skin due to hysteresis
A lack of flux density at the outer edges of the core material as a result of circulating currents at the center of the core.
Soit entier supérieur ou égal à 1 et , muni des opérations usuelles. Quelles sont les assertions vraies ?
.
Soit l'espace des polynômes à coefficients réels de degré inférieur ou égal à 2, muni des opérations usuelles, et , muni des opérations usuelles. Quelles sont les assertions vraies ?
est vide.
n'est pas stable par multiplication par un scalaire.
Soit , muni des opérations usuelles. Quelles sont les assertions vraies ?
est non vide.
est un sous-espace vectoriel de .
n'est pas stable par addition.
est un espace vectoriel.
n'est pas un espace vectoriel, car mais .
n'est pas un espace vectoriel, car et mais .
est un espace vectoriel, car est un sous-ensemble de l'espace vectoriel .
n'est pas un espace vectoriel, car .
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