7 **Hypotheses** represent boundary conditions which will be taken into account by meshing algorithms. The hypotheses allow you to manage the level of detail of the resulting mesh: when applying different hypotheses with different parameters you can preset the quantity or size of elements which will compose your mesh. So, it will be possible to generate a coarse or a more refined mesh.
9 The choice of a hypothesis depends on the selected algorithm.
11 Hypotheses are created during creation and edition of
12 :ref:`constructing_meshes_page`:"meshes" and
13 :ref:`constructing_submeshes_page`:"sub-meshes".
14 Once created a hypotheses can be reused during creation and edition of other meshes and sub-meshes. All created hypotheses and algorithms are present in the Object Browser in *Hypotheses* and *Algorithms* folders correspondingly. It is possible to open a dialog to modify the parameters of a hypothesis from its context menu. This menu also provides **Unassign** command that will unassign the hypothesis from all meshes and sub-meshes using it. Modification of any parameter of a hypothesis and its unassignment leads to automatic removal of elements generated using it.
16 In **MESH** there are the following Basic Hypotheses:
18 * :ref:`a1d_meshing_hypo_page` (for meshing of **edges**):
19 * :ref:`number_of_segments_anchor`
20 * :ref:`average_length_anchor`
21 * :ref:`max_length_anchor`
22 * :ref:`adaptive_1d_anchor`
23 * :ref:`arithmetic_1d_anchor`
24 * :ref:`geometric_1d_anchor`
25 * :ref:`start_and_end_length_anchor`
26 * :ref:`deflection_1d_anchor`
27 * :ref:`automatic_length_anchor`
28 * :ref:`fixed_points_1d_anchor`
30 * :ref:`a2d_meshing_hypo_page` (for meshing of **faces**):
32 * :ref:`max_element_area_anchor`
33 * :ref:`length_from_edges_anchor`
34 * :ref:`hypo_quad_params_anchor`
36 * 3D Hypothesis (for meshing of **volumes**):
38 * :ref:`max_element_volume_hypo_page`
42 There also exist :ref:`additional_hypo_page`:
44 * :ref:`propagation_anchor`
45 * :ref:`propagofdistribution_anchor`
46 * :ref:`viscous_layers_anchor`
47 * :ref:`quadratic_mesh_anchor`
48 * :ref:`quadrangle_preference_anchor`
56 max_element_volume_hypo.rst