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arXiv 2106.01995math.DG
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约束取值于李群的离散Lagrange问题

Discrete Lagrange Problems with Constraints Valued in a Lie Group

Pablo M. Chacón, Antonio Fernández, Pedro L. García

摘要:

拉格朗日问题建立在离散域论中,其约束值在李群中。对于满足一定正则性条件的容许截面,我们证明了这类问题的临界截面是与Lagrange问题(离散Lagrange乘子法则)相联系的正则无约束变分问题的解.这个变分问题具有离散的Cartan 1-形式,由此建立了Noether对称理论和多辛形式公式。整个理论应用于离散域论中的Euler-Poincaré约化,最后以李群$SO(n)$中离散平面的调和映射为例进行说明.

英文摘要:

The Lagrange problem is established in the discrete field theory subject to constraints with values in a Lie group. For the admissible sections that satisfy a certain regularity condition, we prove that the critical sections of such problems are the solutions of a canonically unconstrained variational problem associated with the Lagrange problem (discrete Lagrange multiplier rule). This variational problem has a discrete Cartan 1-form, from which a Noether theory of symmetries and a multisymplectic form formula are established. The whole theory is applied to the Euler-Poincaré reduction in the discrete field theory, concluding as an illustration with the remarkable example of the harmonic maps of the discrete plane in the Lie group $SO(n)$.

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