(1 point) Find the dimensions of the following linear spaces. (a) The space of all diagonal $7 \times 7$ matrices (b) $\mathbb{R}^{4 \times 5}$ (c) $P_6$
Added by Eric L.
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The matrices E11, E22, …, E77 (each with a single 1 on one diagonal position and 0 elsewhere) form a basis, so the dimension is 7. Show more…
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