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The present paper describes the result of the error estimation of a numerical solution to topology optimization problems of domains in which boundary value problems are dened. In the previous paper, we formulated a problem by using density as a design variable, presented a regular solution, and called it the H1 gradient method. The main result in this paper is the proof of the rst order convergence in the H1 norm of the solution in the H1 gradient method with respect to the size of the nite elements if rst order elements are used for the design and state variables.

Error analysis of H1 gradient method for topology optimization problems of continua