If you have a second order elliptic equation but the coefficients of the second order terms only form a nonnegative (instead of positive definite) matrix, then, do you know if there is any literature about this? (For example, the matrix of the second order terms can be diag{1,1,0,0} )
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removed deprecated tag 'analysis' (since question was bumped to the front page)
Ricardo Andrade
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Nearly elliptic equations
dvt
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