**DIPS 2/2006**[tex source, PostScript, PDF file, dvi]-
**Title:**Domains in Infinite Jets: C-Spectral Sequence.**Authors:**A. M. Vinogradov and G. MorenoDomains in infinite jets present the simplest class of diffieties with boundary. In this note some basic elements of geometry of these domains are introduced and an analogue of the C-spectral sequence in this context is studied. This, in particular, allows cohomological interpretation and analysis of initial data, boundary conditions, etc, for general partial differential equations and of transversality conditions in calculus of variations. This kind applications and extensions to arbitrary diffieties will be considered in subsequent publications.

See also arXiv: math.DG/0609079.

7 pages, LaTeX-2e.

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