Let S be the ring of all n X n matrices over a division ring D. (a)

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Let S be the ring of all n X n matrices over a division ring D.

(a) S has no proper ideals (that is, 0 is a maximal ideal). 8 or argue directly, using the matrices Er,s mentioned there.]

(b) S has zero divisors. Consequently,

(i) S ≅ S/0 is not a division ring and

(ii) 0 is a prime ideal which does not satisfy condition (1).

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