Noether's Theorem and Symmetry
In Noether's original presentation of her celebrated theorem of 1918, allowances were made for the dependence of the coefficient functions of the differential operator which generated the infinitesimal transformation of the Action Integral upon the derivatives of the dependent variable(s), the...
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Format:  eBook 
Language:  English 
Published: 
MDPI  Multidisciplinary Digital Publishing Institute
2020

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Collection:  Directory of Open Access Books  Collection details see MPG.ReNa 
Summary:  In Noether's original presentation of her celebrated theorem of 1918, allowances were made for the dependence of the coefficient functions of the differential operator which generated the infinitesimal transformation of the Action Integral upon the derivatives of the dependent variable(s), the socalled generalized, or dynamical, symmetries. A similar allowance is to be found in the variables of the boundary function, often termed a gauge function by those who have not read the original paper. This generality was lost after texts such as those of Courant and Hilbert or Lovelock and Rund confined attention to only point transformations. In recent decades, this diminution of the power of Noether's Theorem has been partly countered, in particular, in the review of Sarlet and Cantrijn. In this Special Issue, we emphasize the generality of Noether's Theorem in its original form and explore the applicability of even more general coefficient functions by allowing for nonlocal terms. We also look at the application of these more general symmetries to problems in which parameters or parametric functions have a more general dependence upon the independent variables. 

Item Description:  Creative Commons (cc), https://creativecommons.org/licenses/byncnd/4.0/ 
Physical Description:  1 electronic resource (186 p.) 
ISBN:  9783039282357 9783039282340 books9783039282357 