GFem language documentation -- 1.1 Conventions

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## 1.1 Conventions

- A triangulation, T, is a set of triangles covering a domain refered later as Omega
- Each vertex has a number iv, a region reference number region, and a boundary reference number ib which is zero for internal points.
- An array-function is an array of values on the vertices of T. It represents a piecewise linear continuous (or discontinuous if `precise` is used) function on Omega.
- In an integrated environment Gfem has the notion of Project: files shown on the desktop as documents with an icon like a triangulated rectangle (on the Macintosh).
- A project contains a program, the last triangulation created and one array function, namely the last function displayed.