Derivation-invariance does not satisfy intermediate subring condition
This article gives the statement, and possibly proof, of a Lie subring property (i.e., derivation-invariant Lie subring) not satisfying a Lie subring metaproperty (i.e., intermediate subring condition).
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ANALOGY: This is an analogue in Lie rings of a fact encountered in group. The old fact is: characteristicity does not satisfy intermediate subgroup condition.
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Statement
There can exist a Lie ring , a derivation-invariant Lie subring of , and a subring of containing , such that is a derivation-invariant Lie subring of .