Show that for a field F, the set S of all matrices of the form for a,
Question:
Show that for a field F, the set S of all matrices of the form
for a, b ∈ F is a right ideal but not a left ideal of M2(F). That is, show that S is a subring closed under multiplication on the right by any element of M2(F), but is not closed under left multiplication.
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Clearly S is closed under addition contains the zero matrix and contains the additive i...View the full answer
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