Algebraic entropy computations for lattice equations: why initial value problems do matter
Algebraic entropy computations for lattice equations: why initial value problems do matter
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晶格方程的代数熵计算:为什么初始值问题很重要
DOI:
10.1088/1751-8121/ab5238
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
T. Mase and R. Willox
中科院分区:
文献类型:
--
作者:
J. Hietarinta;T. Mase and R. Willox
In this letter we show that the results of degree growth (algebraic entropy) calculations for lattice equations strongly depend on the initial value problem that one chooses. We consider two problematic types of initial value configurations, one with problems in the past light-cone, the other one causing interference in the future light-cone, and apply them to Hirota's discrete KdV equation and to the discrete Liouville equation. Both of these initial value problems lead to exponential degree growth for Hirota's dKdV, the quintessential integrable lattice equation. For the discrete Liouville equation, though it is linearizable, one of the initial value problems yields exponential degree growth whereas the other is shown to yield non-polynomial (though still sub-exponential) growth. These results are in contrast to the common belief that discrete integrable equations must have polynomial growth and that linearizable equations necessarily have linear degree growth, regardless of the initial value problem one imposes. Finally, as a possible remedy for one of the observed anomalies, we also propose basing integrability tests that use growth criteria on the degree growth of a single initial value instead of all the initial values.
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DOI:
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发表时间:
2001
期刊:
影响因子:
--
作者:
J. Diller;C. Favre
通讯作者:
C. Favre
DOI:
10.1088/0305-4470/34/48/303
发表时间:
2001
期刊:
Journal of Physics A: Mathematical and General
影响因子:
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作者:
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通讯作者:
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DOI:
10.1088/0305-4470/34/48/317
发表时间:
2001
期刊:
Journal of Physics A
影响因子:
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作者:
T. Takenawa
通讯作者:
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DOI:
10.1017/cbo9781107337411
发表时间:
2016-08
期刊:
--
影响因子:
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作者:
J. Hietarinta;N. Joshi;F. Nijhoff
通讯作者:
J. Hietarinta;N. Joshi;F. Nijhoff
DOI:
10.1007/bf01236277
发表时间:
1990
期刊:
Boletim da Sociedade Brasileira de Matemática - Bulletin/Brazilian Mathematical Society
影响因子:
--
作者:
V. Arnold
通讯作者:
V. Arnold