Mathematics – Group Theory
Scientific paper
2010-09-26
Mathematics
Group Theory
Scientific paper
For k a field of characteristic 2, we show that there is a unique continuous
automorphism of order 4 of the power series ring k[[t]] which sends t to t +
t^2 + (t^6) + (t^{12} + t^{14}) + (t^{24} + t^{26} + t^{28} + t^{30}) + ... .
For j >= 0, the j-th sum in parentheses has 2^j terms beginning at t^{6*2^j},
with successive terms in the j-th sum raising the exponent of t by 2.
Chinburg Ted
Symonds Peter
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