User contributions for Adrian

03:3403:34, 28 October 2023 diff hist +1,649‎ N 28247 ‎ Pagină nouă: '''28247 (Florin Bojor)''' ''Fie matricele <math>A, B \in \mathcal{M}_3(\mathbb{C}),</math> care verifică simultan condițiile: <ol style="list-style-type:lower-roman"> <li><math>AB = BA;</math></li> <li>matricea <math>A</math> este nilpotentă și matricea <math>B</math> este inversabilă. Arătați că ecuația <math>AX + XA = B</math> nu are soluții în <math>\mathcal{M}_3(\mathbb{C})</math>.</li> </ol> '''Soluție:''' Prin reducere la absurd, pre... current

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28 October 2023

23 May 2023