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Matrix Operator form using Mathematica


Hello all,

How do I define an operator embedded in a matrix and functions 
as...well........an operator

azero={{0,1},{1,0.05}};
aone={{-1,0},{0,(k)}};
(*k is the second order differential operator with respect to x d,xx, Is 
there a way to define this in mathematica *)


Thanks

Pratik Desai


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