Criteria for [IMG align=ABSMIDDLE alt=$ C^1$]tex_im_3058_img1[/IMG]-approximability of functions by solutions of homogeneous elliptic equations of second order on compact sets in [IMG align=ABSMIDDLE alt=$ R^N$]tex_im_3058_img2[/IMG], [IMG align=ABSMIDDLE alt=$ N geq 3$]tex_im_3058_img3[/IMG]
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2012 ◽
Vol 364
(5)
◽
pp. 2443-2460
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1989 ◽
pp. 939-957
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2019 ◽
Vol 266
(2-3)
◽
pp. 936-941
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