Studies in Rings generalised Unique Factorisation Rings
Studies in Rings generalised Unique Factorisation Rings
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,