### Abstract

Let Ω ⊂ ℝ^{d}, d ≥ 1, be a bounded domain with piecewise smooth boundary ∂Ω and let U be an open subset of a Banach space Y. Motivated by questions in "Uncertainty Quantification," we consider a parametric family P = (P_{y})_{y∈U} of uniformly strongly elliptic, second order partial differential operators P_{y} on Ω. We allow jump discontinuities in the coefficients. We establish a regularity result for the solution u: Ω x U → ℝ of the parametric, elliptic boundary value/transmission problem P_{y} u _{y} = f_{y}, y ∈ U, with mixed Dirichlet-Neumann boundary conditions in the case when the boundary and the interface are smooth and in the general case for d = 2. Our regularity and well-posedness results are formulated in a scale of broken weighted Sobolev spaces K̂ _{a+1}^{m+1} (Ω) of Babuška-Kondrat'ev type in Ω, possibly augmented by some locally constant functions. This implies that the parametric, elliptic PDEs (P_{y})_{y∈U} admit a shift theorem that is uniform in the parameter y ∈ U. In turn, this then leads to h^{m}-quasi-optimal rates of convergence (i. e., algebraic orders of convergence) for the Galerkin approximations of the solution u, where the approximation spaces are defined using the "polynomial chaos expansion" of u with respect to a suitable family of tensorized Lagrange polynomials, following the method developed by Cohen, Devore, and Schwab (2010).

Original language | English (US) |
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Title of host publication | Numerical Analysis and Its Applications - 5th International Conference, NAA 2012, Revised Selected Papers |

Pages | 12-23 |

Number of pages | 12 |

DOIs | |

Publication status | Published - Nov 7 2013 |

Event | 5th International Conference on Numerical Analysis and Applications, NAA 2012 - Lozenetz, Bulgaria Duration: Jun 15 2013 → Jun 20 2013 |

### Publication series

Name | Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) |
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Volume | 8236 LNCS |

ISSN (Print) | 0302-9743 |

ISSN (Electronic) | 1611-3349 |

### Other

Other | 5th International Conference on Numerical Analysis and Applications, NAA 2012 |
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Country | Bulgaria |

City | Lozenetz |

Period | 6/15/13 → 6/20/13 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Theoretical Computer Science
- Computer Science(all)

### Cite this

*Numerical Analysis and Its Applications - 5th International Conference, NAA 2012, Revised Selected Papers*(pp. 12-23). (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 8236 LNCS). https://doi.org/10.1007/978-3-642-41515-9_2