例文
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- The normalizer should not be confused with the normal closure.
- Any normal subgroup is equal to its normal closure.
- But London Transport said extra subway trains would run after the normal closure time to ease congestion.
- normal closure that includes the complex cube roots of unity, and so is not a splitting field.
- Equivalently, a subgroup is paranormal if its weak closure and normal closure coincide in all intermediate subgroups.