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# Answer to Question #25254 in Abstract Algebra for Tsit Lam

Question #25254
Show that a ring R can be embedded into a left primitive ring iff either char R is a prime number p &gt; 0, or (R, +) is a torsion-free abelian group.
1
2013-03-01T05:45:16-0500
First assume R is in S, where S is aleft primitive ring. Then S is a prime ring, char R = char S is either a prime
number p,or char R = 0. In the latter case, for any integer n &ge; 1, n &middot; 1is not
a 0-divisor in S. Clearly, this implies that (R,+) is torsion-free.
Conversely, assume char R is a primep, or that (R,+) is torsion-free. In either case, R can be embedded into a
k-algebra A over some ﬁeld k. Now the &ldquo;left regular representation&rdquo;
ϕ : A &rarr; Endk(A)
deﬁned by ϕ(a)(b)= ab for a, b from A is anembedding of A (and hence of R) into the left (and incidentally also right)
primitive k-algebra Endk A.

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