Show that for any ring R, soc(R) is an ideal of R.
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Expert's answer
2012-11-19T07:48:30-0500
For any minimal left ideal I ⊆ R and any r ∈ R, Ir is a homomorphic image of RI,so Ir is either 0 or another minimal left ideal. Since soc(RR)=(sum) I, we see that soc(RR) is an ideal.
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