Robinson, DerekSikora, Adam2015-12-070391-173Xhttp://hdl.handle.net/1885/26254Let Ω be an open subset of Rd and HΩ - Σdi,j 1 ∂iij ∂j be a second-order partial differential operator on L2(Ω) with domain C∞0(Ω), where the coefficients cij ε W1,∞(Ω) are real symmetric and C = (cij) is a strictly positive-definite matrixAuthor/s retain copyright20112015-12-07