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Showing 1 to 2 of 2 for “"HNN EXTENSION"”.
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Proper decompositions of finitely presented groups
… decomposition as an amalgamated free product or HNN-extension is often not straightforward. In a presentation 2-complex for G, there are special subsets called patterns and tracks. Bass-Serre theory and van Kampen's theorem show that given such a G, there exists a proper decomposition if and only …
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ΟΜΑΔΕΣ ΑΥΤΟΜΟΡΦΙΣΜΩΝ ΤΩΝ ΟΜΑΔΩΝ ΜΙΑΣ ΟΡΙΖΟΥΣΑΣ ΣΧΕΣΗΣ
AT THE SECOND CHAPTER THE DERIVED SUBGROUP OF GROUPS WITH ONE DEFINING RELATIONSTUDIED. AT THE THIRD CHAPTER THE GROUP OF AUTOMORPHISMS OF CERTAIN ONE RELATOR GROUPS STUDIED. AT THE IV CHAPTER THE RESIDUAL PROPERTIES STUDIED LIKE RESIDUALLY FINITENESS, RESIDUALLY NILPOTENCE ETC.