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Erratum to “Conserved vectors with conformable derivative for certain systems of partial differential equations with physical applications”

  • Pinki Kumari , R. K. Gupta , Sachin Kumar EMAIL logo and Maysaa Mohamed Al Qurashi
Published/Copyright: December 29, 2020

Abstract

This erratum corrects the typing mistakes of the article “Conserved vectors with conformable derivative for certain systems of partial differential equations with physical applications,” published in Open Physics 2020;18(1):164–9, https://doi.org/10.1515/phys-2020-0127.

1 The dispersive long-wave system

In ref. [1], the classical dispersive long-wave system is given by

(1) u t = ( u 2 u x + 2 v ) x , v t = ( 2 u v + v x ) x ,

which is used to describe evolution of the horizontal velocity portion of water waves. We present here the correct form of (1) with conformable operator as

(2) α u t α = 2 u α u x α 2 α u x 2 α + 2 α v x α , α v t α = 2 u α v x α + 2 v α u x α + 2 α v x 2 α .

We present the symmetries of the correct version of conformable dispersive long-wave system described in (2) as

(3) ξ 1 = c 1 t α + c 2 t 1 α , ξ 2 = c 1 2 α x + c 4 x 1 α + c 3 α x 1 α t α , η 1 = c 1 2 u c 3 2 , η 2 = c 1 v .

Thus, the Lie algebra of (2) is spanned by the following four generators:

(4) X 1 = t α t + x 2 α x 1 2 u u v v , X 2 = t 1 α t , X 3 = x 1 α t α α x 1 2 u , X 4 = x 1 α x .

Below, we will present the correct form of conserved vectors.

For the symmetry X 1 = t α t + x 2 α x 1 2 u u v v , we obtain

(5) T 1 t = c 1 x α 1 1 2 u x 2 α u x t α u t + c 2 x α 1 v x 2 α v x t α v t , T 1 x = 2 1 2 u x 2 α u x t α u t ( c 1 u c 2 v ) t 1 α c 1 1 2 u x + x 2 α u x x + 1 2 α u x + 1 α u t x x 1 α t α 1 v x 2 α v x t α v t ( 2 c 1 + 2 c 2 u + c 2 x α + c 2 ( 1 α ) x α ) t α 1 + c 2 v x + x 2 α v x x + 1 2 α v x + 1 α v t x x 1 α t α 1 .

For the symmetry X 2 = t 1 α t , we obtain

(6) T 1 t = c 1 x α 1 t 1 α u t c 2 x α 1 t 1 α v t , T 1 x = t 1 α u t ( c 1 u c 2 v ) t 1 α c 1 t 1 α u t x x 1 α t α 1 + t 1 α v t ( 2 c 1 + 2 c 2 u + c 2 x α + c 2 ( 1 α ) x α ) t α 1 + c 2 v t x x 1 α .

For the symmetry X 3 = x 1 α t α α x 1 2 u , we obtain

(7) T 1 t = c 1 x α 1 1 2 x 1 α t α α u x c 2 t α α v x , T 1 x = 1 2 x 1 α t α α u x ( c 1 u c 2 v ) t 1 α c 1 ( 1 α ) α u x + 1 α x u x x x 1 2 α t 2 α 1 + x 1 α t α α v x ( 2 c 1 + 2 c 2 u + c 2 x α + c 2 ( 1 α ) x α ) t α 1 + c 2 ( 1 α ) α v x + 1 α x v x x x 1 2 α t 2 α 1 .

For the symmetry X 4 = x 1 α x , we obtain

(8) T 1 t = c 1 u x c 2 v x , T 1 x = x 1 α u x ( c 1 u c 2 v ) t 1 α c 1 ( ( 1 α ) u x + x u x x ) x 1 2 α t α 1 + x 1 α v x ( 2 c 1 + 2 c 2 u + c 2 x α + c 2 ( 1 α ) x α ) t α 1 + c 2 ( ( 1 α ) v x + x v x x ) x 1 2 α t α 1 .

2 The Whitham–Broer–Kaup system

The conformable Whitham–Broer–Kaup Wilson system used in ref. [1] is given by

(9) α u t α + u α u x α + μ 2 α u x 2 α + α v x α = 0 , α v t α + u α v x α + v α u x α μ 2 α v x 2 α + β 3 α v x 3 α = 0 .

We present the following symmetries for system (9)

(10) ξ 1 = c 1 t α + c 2 t 1 α , ξ 2 = c 1 2 α x + c 4 x 1 α + c 3 α x 1 α t α , η 1 = c 1 2 u + c 3 , η 2 = c 1 v .

Thus, the Lie algebra of (9) is spanned by the following four generators

(11) X 1 = t α t + x 2 α x 1 2 u u v v , X 2 = t 1 α t , X 3 = x 1 α t α α x + u , X 4 = x 1 α x .

In the next step, we present the correct version of the conserved vectors for system (9).

For the symmetry X 1 = t α t + x 2 α x 1 2 u u v v , we obtain

(12) T 1 t = c 1 x α 1 1 2 u x 2 α u x t α u t + c 2 x α 1 v x 2 α v x t α v t , T 1 x = 1 2 u x 2 α u x t α u t ( c 1 u + c 1 μ c 2 x α + c 2 v + c 1 β (1 α )(1 2 α ) x 2 α c 1 μ (1 α ) x α 3 c 2 β (1 α ) 2 x α + c 2 β (2 2 α )(1 α ) x α ) t α 1 1 2 u x + x 2 α u x x + 1 2 α u x + 1 α u t x × ( c 1 μ x 1 α + 3 β (1 α ) c 2 x 1 2 α c 2 β x 2 2 α ) t α 1 1 2 u x x + 1 2 α u x x + x 2 α u x x x + 1 2 α u x x + 1 α u t x x × c 2 x 2 2 α t α 1 + v x 2 α v x t α v t × ( c 1 + c 2 u c 2 μ (1 α ) x 1 α + c 2 μ (1 α ) x α ) t α 1 v x + x 2 α v x x + 1 2 α v x + 1 α v t x c 2 μ x 1 α t α 1 .

For the symmetry X 2 = t 1 α t , we obtain

(13) T 1 t = c 1 x α 1 t 1 α u t c 2 x α 1 t 1 α v t , T 1 x = u t ( c 1 u + c 1 μ c 2 x α + c 2 v + c 1 β ( 1 α ) × ( 1 2 α ) x 2 α c 1 μ ( 1 α ) x α 3 c 2 β ( 1 α ) 2 x α + c 2 β ( 2 2 α ) ( 1 α ) ) x α u t x ( c 1 μ x 1 α + 3 β ( 1 α ) c 2 x 1 2 α c 2 β x 2 2 α ) u t x x c 2 x 2 2 α v t ( c 1 + c 2 u c 2 μ ( 1 α ) x 1 α + c 2 μ ( 1 α ) x α ) c 2 μ x 1 α v t x .

For the symmetry X 3 = x 1 α t α α x + u , we obtain

(14) T 1 t = c 1 x α 1 1 x 1 α t α α u x c 2 t α α v x , T 1 x = 1 x 1 α t α α u x ( c 1 u + c 1 μ c 2 x α + c 2 v + c 1 β (1 α )(1 2 α ) x 2 α c 1 μ (1 α ) x α 3 c 2 β (1 α ) 2 x α + c 2 β (2 2 α )(1 α ) ) x α t α 1 (1 α ) α u x + 1 α x u x x ( c 1 μ x 1 α + 3 β (1 α ) c 2 x 1 2 α c 2 β x 2 2 α ) t 2 α 2 (1 α ) α u x x + 1 α x u x x x + 1 α u x x × c 2 x 2 2 α t α 1 + x 1 α t α α v x (2 c 1 + 2 c 2 u + c 2 x α + c 2 (1 α ) x α ) t α 1 + c 2 μ (1 α ) α v x + 1 α x v x x x 1 2 α t 2 α 1 .

For the symmetry X 4 = x 1 α x , we obtain

(15) T 1 t = c 1 u x c 2 v x , T 1 x = x 1 α u x ( c 1 u + c 1 μ c 2 x α + c 2 v + c 1 β ( 1 α ) × ( 1 2 α ) x 2 α c 1 μ ( 1 α ) x α 3 c 2 β ( 1 α ) 2 × x α + c 2 β ( 2 2 α ) ( 1 α ) x α ) t α 1 ( ( 1 α ) x α u x + x 1 α u x x ) × ( c 1 μ x 1 α + 3 β ( 1 α ) c 2 x 1 2 α c 2 β x 2 2 α ) t α 1 ( 2 ( 1 α ) x α u x x α ( 1 α ) x α 1 u x + x 1 α u x x x ) c 2 x 2 2 α t α 1 x 1 α v x ( c 1 + c 2 u c 2 μ ( 1 α ) x 1 α + c 2 μ ( 1 α ) x α ) t α 1 ( ( 1 α ) x α v x + x 1 α v x x ) c 2 μ x 1 α t α 1 .

Reference

[1] Al Qurashi MM. Conserved vectors with conformable derivative for certain systems of partial differential equations with physical applications. Open Phys. 2020;18(1):164–9.10.1515/phys-2020-0127Search in Google Scholar

Received: 2020-09-27
Accepted: 2020-11-27
Published Online: 2020-12-29

© 2020 Pinki Kumari et al., published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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