Hypotheses represent boundary conditions which will be taken into account at calculations of meshes or submeshes basing on geometrical objects. These hypotheses allow you to manage the level of detail of the resulting meshes or submeshes: when applying different hypotheses with different parameters you can preset the quantity of meshing elements which will compose your mesh. So, it will be possible to generate a rough or a more refined mesh or submesh.
In MESH there are the following Basic Hypotheses (to introduce them, you operate numerical values):
1D Hypotheses (for meshing of edges):
2D Hypotheses (for meshing of faces):
3D Hypothesis (for meshing of volumes):
There also exist some Additional Hypotheses
Propagation of 1D Hypothesis on opposite edges
Non conform mesh allowed
Quadratic mesh
The choice of a hypothesis depends on:
the geometrical object (shape) which will be meshed
the algorithm, which will be selected for meshing of this geometrical object (shape)