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  "body": "\n## Statement\n\nThe **universal embedding theorem**, or **Krasner–Kaloujnine universal embedding theorem**, is a theorem from the mathematical discipline of group theory first published in 1951 by Marc Krasner and Lev Kaluznin. The theorem states that any group extension of a group $H$ by a group $A$ is isomorphic to a subgroup of the regular wreath product $A \\operatorname{Wr} H.$ The theorem is named for the fact that the group $A \\operatorname{Wr} H$ is said to be *universal* with respect to all extensions of $H$ by $A.$\n",
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