Su alcune relazioni tra una funzione armonica e la funzione coniugata
On some relations between a harmonic function and its conjugate.
Remark to the dependence of solution of nonlinear operator equation on the space in which it is solved
О приближенном решении задачи Дирихле
Approximation of domains with Lipschitzian boundary
Smooth functions and zero traces
On the density of smooth functions in certain subspaces of Sobolev space
Perturbations of variational inequalities and rate of convergence of solutions
The density of infinitely differentiable functions in Sobolev spaces with mixed boundary conditions
We present a detailed proof of the density of the set in the space of test functions that vanish on some part of the boundary of a bounded domain .
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