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February  2019, 13(1): 149-157. doi: 10.3934/ipi.2019008

## Note on Calderón's inverse problem for measurable conductivities

 Department of Mathematics, University of Genoa, Via Dodecaneso 35, 16146 Genova, Italy

Received  February 2018 Revised  June 2018 Published  December 2018

The unique determination of a measurable conductivity from the Dirichlet-to-Neumann map of the equation ${\rm{div}} (σ \nabla u) = 0$ is the subject of this note. A new strategy, based on Clifford algebras and a higher dimensional analogue of the Beltrami equation, is here proposed. This represents a possible first step for a proof of uniqueness for the Calderón problem in three and higher dimensions in the $L^\infty$ case.

Citation: Matteo Santacesaria. Note on Calderón's inverse problem for measurable conductivities. Inverse Problems & Imaging, 2019, 13 (1) : 149-157. doi: 10.3934/ipi.2019008
##### References:
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show all references

##### References:
 [1] G. Alessandrini, Stable determination of conductivity by boundary measurements, Applicable Analysis, 27 (1988), 153-172.  doi: 10.1080/00036818808839730.  Google Scholar [2] G. Alessandrini and R. Magnanini, Elliptic equations in divergence form, geometric critical points of solutions, and Stekloff eigenfunctions, SIAM Journal on Mathematical Analysis, 25 (1994), 1259-1268.  doi: 10.1137/S0036141093249080.  Google Scholar [3] K. Astala, M. Lassas and L. Päivärinta, The borderlines of the invisibility and visibility for Calderón's inverse problem, Anal. PDE, 9 (2016), 43-98.  doi: 10.2140/apde.2016.9.43.  Google Scholar [4] K. Astala and L. Päivärinta, Calderón's inverse conductivity problem in the plane, Annals of Mathematics, 163 (2006), 265-299.  doi: 10.4007/annals.2006.163.265.  Google Scholar [5] M. I. Belishev and A. F. Vakulenko, On algebras of harmonic quaternion fields in $\mathbb{R}^3$, arXiv preprint, arXiv: 1710.00577, 2017. Google Scholar [6] M. I. Belishev, On algebras of three-dimensional quaternion harmonic fields, Journal of Mathematical Sciences, 226 (2017), 701-710.  doi: 10.1007/s10958-017-3559-1.  Google Scholar [7] M. I. Belishev, Some remarks on the impedance tomography problem for 3d-manifolds, Cubo, 7 (2005), 43-55.   Google Scholar [8] L. Bers and L. Nirenberg, On a representation theorem for linear elliptic systems with discontinuous coefficients and its applications, Convegno Internazionale sulle Equazioni Lineari alle Derivate Parziali, Trieste, 1954. Google Scholar [9] F. Brackx, R. Delanghe and F. Sommen, Clifford Analysis, vol. 76, Pitman Books Limited, 1982.  Google Scholar [10] R. M. Brown and R. H. Torres, Uniqueness in the inverse conductivity problem for conductivities with 3/2 derivatives in Lp, p > 2n, The Journal of Fourier Analysis and Applications, 9 (2003), 563-574.  doi: 10.1007/s00041-003-0902-3.  Google Scholar [11] A. Calderón, On an inverse boundary value problem,, Seminar on Numerical Analysis and its Applications to Continuum Physics (Soc. Brasil. Mat., Rio de Janeiro), (1980), 65-73.   Google Scholar [12] P. Caro and K. M. Rogers, Global uniqueness for the Calderón problem with Lipschitz conductivities, in Forum of Mathematics, Pi, 4 (2016), e2, 28pp. doi: 10.1017/fmp.2015.9.  Google Scholar [13] B. B. Delgado and R. M. Porter, General solution of the inhomogeneous div-curl system and consequences, Advances in Applied Clifford Algebras, 27 (2017), 3015-3037.  doi: 10.1007/s00006-017-0805-z.  Google Scholar [14] B. B. Delgado and R. M. Porter, Hilbert transform for the three-dimensional vekua equation, arXiv preprint, arXiv: 1803.03293, 2018. Google Scholar [15] L. D. Faddeev, Increasing solutions of the Schrödinger equation, Soviet Physics Doklady, 10 (1966), 1033-1035.   Google Scholar [16] K. Gürlebeck and W. Sprößig, Quaternionic analysis and elliptic boundary value problems, Int. Series of Numerical Mathematics, 89. Google Scholar [17] B. Haberman, Uniqueness in Calderón problem for conductivities with unbounded gradient, Communications in Mathematical Physics, 340 (2015), 639-659.  doi: 10.1007/s00220-015-2460-3.  Google Scholar [18] C. Li, A. G. McIntosh and T. Qian, Clifford algebras, Fourier transforms and singular convolution operators on Lipschitz surfaces, Revista Matematica Iberoamericana, 10 (1994), 665-721.  doi: 10.4171/RMI/164.  Google Scholar [19] A. I. Nachman, Global uniqueness for a two-dimensional inverse boundary value problem, Annals of Mathematics, 143 (1996), 71-96.  doi: 10.2307/2118653.  Google Scholar [20] J. Sylvester and G. Uhlmann, A global uniqueness theorem for an inverse boundary value problem, Annals of Mathematics, 125 (1987), 153-169.  doi: 10.2307/1971291.  Google Scholar [21] V. I. Vekua, Generalized Analytic Functions, Pergamon Press London, 1962.  Google Scholar
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