3h
revised The automorphism groups of smallest grammars of a language string are isomorphic
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revised The automorphism groups of smallest grammars of a language string are isomorphic
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8h
comment The automorphism groups of smallest grammars of a language string are isomorphic
@Goldstem the set acted on are the positions on the RHS of the grammars. You can list the grammar RHS's in any order, label their positions and compute the symmetry group. So $\langle 1,2 \rangle$ applied to the grammar as listed: $BB$, then $ab$, we have a fixed grammar by the symmetry of $BB$. The smallest grammar has the standard definition of the total number of symbols on RHS's of grammar rules. SO, in order to do this, each grammar you act on you fix an order of positions within the grammar.
14h
asked The automorphism groups of smallest grammars of a language string are isomorphic
21h
comment Finite groups acting on strings.
what do you mean by composition factor?
23h
comment Finite groups acting on strings.
Thanks. Does anyone apply it to the smallest grammar problem directly? To yield approx smallest grammars?
23h
accepted Finite groups acting on strings.
23h
revised Finite groups acting on strings.
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23h
asked Finite groups acting on strings.
2d
comment Can you give an example of an irreducible element of the ring of Dirichlet series with integer coefficients?
@anon are those the only known ones? Also do you have a link showing that result?
2d
asked Can you give an example of an irreducible element of the ring of Dirichlet series with integer coefficients?
2d
comment Proving associativity of product of two formal sums $\sum_{n = 1}^{\infty} \frac{a_n}{n^x}$
Holy shit! Thanks.
2d
asked Proving associativity of product of two formal sums $\sum_{n = 1}^{\infty} \frac{a_n}{n^x}$
Mar
26
asked Does there exists an automorphism of $\Bbb{C}$ that's also an exponential hom?
Mar
25
awarded Self-Learner
Mar
25
accepted Have you seen this topology before? (related to Furstenberg's arithmetic sequences)
Mar
25
revised Have you seen this topology before? (related to Furstenberg's arithmetic sequences)
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Mar
25
revised Have you seen this topology before? (related to Furstenberg's arithmetic sequences)
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Mar
25
revised Have you seen this topology before? (related to Furstenberg's arithmetic sequences)
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Mar
25
revised Have you seen this topology before? (related to Furstenberg's arithmetic sequences)
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