derived subgroup is normal - SERP Analysis

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https://planetmath.org/derivedsubgroup

https://en.wikipedia.org/wiki/Commutator_subgroup

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https://www.quora.com/How-do-you-find-the-derived-subgroups-of-D4

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https://www.youtube.com/watch?v=LLCd4DQYNFE

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https://www.mdpi.com/2227-7390/8/4/472

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https://www.youtube.com/watch?v=_wMZV3YS6w0

https://taylorandfrancis.com/knowledge/Engineering_and_technology/Engineering_support_and_special_topics/Commutator_subgroup/

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https://www.maplesoft.com/support/help/Maple/view.aspx?path=GroupTheory/DrawSubgroupLattice&cid=391

https://proofwiki.org/wiki/Category:Normal_Subgroups

https://link.springer.com/content/pdf/10.1007/s11202-006-0102-x.pdf?pdf=inline%20link

https://www.tiktok.com/%40donovinrussell/video/7496505155760737582