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Studies in Rings generalised Unique Factorisation Rings

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-14-<br />

Def<strong>in</strong>ition 1 029.<br />

An ideal P <strong>in</strong> a r<strong>in</strong>g R is said to be<br />

right (left)<br />

Qximitive pr0vided P = ann RA for some simple right<br />

(left) R-module A.<br />

A right (left) primitive r<strong>in</strong>g is<br />

any r<strong>in</strong>g <strong>in</strong> which 0 is a primitive ideal, ie. any r<strong>in</strong>g<br />

with a<br />

faithful, simple right (left) R-module.<br />

Proposition 1 030.<br />

In any r<strong>in</strong>g R,<br />

the follow<strong>in</strong>g sets co<strong>in</strong>cide:<br />

(a)<br />

(b)<br />

The <strong>in</strong>tersection of all maximal right ideals.<br />

The <strong>in</strong>tersection of all ma x ima 1 left ideals.<br />

( c) The <strong>in</strong>tersection of all right primitive ideals.<br />

(d) The <strong>in</strong>tersection of all left primitive ideals.<br />

Def<strong>in</strong>ition 1 0:31.<br />

A r<strong>in</strong>g R is semiprimitive (Jacobson Se~i5imple) if<br />

and only if the Jacobson radical J(R) of R is equal to<br />

zero where J(R) is the <strong>in</strong>tersection def<strong>in</strong>ed <strong>in</strong> proposition 1.30.<br />

SEMISIMPLE RINGS<br />

Vector spaces, when viewed module theoretically,

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