The Top of the Lattice of Normal Subgrou
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Tullio Ceccherini-Silberstein; Fabio Scarabotti; Filippo Tolli
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Article
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2001
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Elsevier Science
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English
⚖ 182 KB
A complete description of the lattice of all normal subgroups not contained in the stabilizer of the fourth level of the tree and, consequently, of index ≤ 2 12 in the Grigorchuk group G is given. This leads to the following sharp version of the congruence property: a normal subgroup not contained i