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by
Dobrev, V. K., author.
Format:
Excerpt:
vectors, and conditionally invariant equations -- Invariant differential operators for noncompact Lie
by
Triebel, Hans.
Format:
Excerpt:
, global analysis, differential equations on manifolds, and mathematical physics, and for the readers who
by
Knowles, Ian W.
Format:
Excerpt:
. Transformations of ordinary differential operators; Chapter 2. Finiteness criteria for the negative spectrum and





