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The essential self-adjointness of differential operators with positive coefficients. (English) Zbl 0403.35031

35J30 Higher-order elliptic equations
35R20 Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions)
47F05 General theory of partial differential operators (should also be assigned at least one other classification number in Section 47-XX)
Full Text: DOI
[1] Schechter., Spectra of Partial Differential Operators (1971)
[2] Keller., Proc. Roy. Soc. Edinb. Sect. A 82 pp 305– (1979) · Zbl 0403.35030 · doi:10.1017/S0308210500011264
[3] DOI: 10.1007/BF00250679 · Zbl 0326.35018 · doi:10.1007/BF00250679
[4] DOI: 10.1112/jlms/s1-43.1.465 · Zbl 0162.39202 · doi:10.1112/jlms/s1-43.1.465
[5] DOI: 10.1112/jlms/s2-7.2.343 · Zbl 0269.34014 · doi:10.1112/jlms/s2-7.2.343
[6] DOI: 10.1007/BF02760233 · Zbl 0246.35025 · doi:10.1007/BF02760233
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