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# Footnotes

### (1)

Note that mixing structured volume grids with unstructured volume grids generated with the default 3D Delaunay algorithm can result, in certain cases, to non-conform surface meshes on their shared boundary. If this happens, you may consider using the frontal algorithm for the unstructured part.

### (2)

Nearly all the
interactive commands have shortcuts: see Keyboard shortcuts, or
select `Help->Keyboard Shortcuts' in the menu. For example, to quickly
save a mesh, you can press `Ctrl+Shift+s`.

### (3)

If you compile Gmsh without the GUI, this is the only mode you have access to.

### (4)

The affectation operators are introduced in General commands.

### (5)

For compatibility with GetDP
(http://www.geuz.org/getdp/), parentheses can be replaced by brackets
`[]`

.

### (6)

For
compatibility purposes, the behavior of `newl`

, `news`

,
`newv`

and `newreg`

can be modified with the
`Geometry.OldNewReg`

option (see section Geometry options list).

### (7)

R. A. Dwyer, *A simple
divide-and-conquer algorithm for computing Delaunay triangulations in
O(n log n) expected time*, In Proceedings of the second annual symposium
on computational geometry, Yorktown Heights, 2–4 June 1986.

### (8)

N. P. Weatherill,
*The integrity of geometrical boundaries in the two-dimensional
Delaunay triangulation*, Commun. Appl. Numer. Methods 6(2),
pp. 101–109, 1990.

### (9)

C. Geuzaine and J.-F. Remacle,
*Gmsh: a three-dimensional finite element mesh generator with
built-in pre- and post-processing facilities*, International Journal for
Numerical Methods in Engineering, Accepted for publication, 2009.

### (10)

P.-L. George and P. Frey, *Mesh generation*, Hermes,
Lyon, 2000.

### (11)

S. Rebay, *Efficient unstructured mesh generation
by means of Delaunay triangulation and Bowyer-Watson algorithm*,
J. Comput. Phys. 106, pp. 25–138, 1993.

### (12)

H. Si, *Tetgen: a quality
tetrahedral mesh generator and three-dimensional Delaunay triangulator*,
2004.

### (13)

J. Schoeberl, *Netgen, an advancing front 2d/3d-mesh
generator based on abstract rules*, Comput. Visual. Sci., 1, pp. 41–52,
1997.

### (14)

This behaviour was introduced in Gmsh 2.0. In older versions, both the elementary and the physical region numbers would be set to the identification number of the elementary region.

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