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Reference.org
Core (group theory)
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<p>In <a href="/facts/Group_theory/NfowcI5H">group theory</a>, a branch of <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a core is any of certain special <a href="/facts/Normal_subgroup/aRDaGwLm">normal subgroups</a> of a <a href="/facts/Group_(mathematics)/IQTYqINt">group</a>. The two most common types are the normal core of a <a href="/facts/Subgroup/r91mBgpa">subgroup</a> and the <i>p</i>-core of a group. </p>