Quadratic maps with a periodic critical point of period 2
2016 ◽
Vol 13
(06)
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pp. 1393-1417
Keyword(s):
Period 2
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We provide a complete classification of possible graphs of rational preperiodic points of endomorphisms of the projective line of degree 2 defined over the rationals with a rational periodic critical point of period 2, under the assumption that these maps have no periodic points of period at least 7. We explain how this extends results of Poonen on quadratic polynomials. We show that there are exactly 13 possible graphs, and that such maps have at most nine rational preperiodic points. We provide data related to the analogous classification of graphs of endomorphisms of degree 2 with a rational periodic critical point of period 3 or 4.
2017 ◽
Vol 28
(03)
◽
pp. 1750022
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2017 ◽
Vol 16
(10)
◽
pp. 1750197
◽
2016 ◽
Vol 31
(17)
◽
pp. 1650102
◽
2003 ◽
Vol 35
(6)
◽
pp. 1059-1076
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Keyword(s):