Updating tensor-symmetry page for docs, remove trigonal8

docs/tutorial.rst

@@ -9,4 +9,5 @@ Tutorials
    tutorial/handling-units.ipynb
    tutorial/voigt.ipynb
    tutorial/strain-diagonalization.ipynb
-   tutorial/shear-elastic-modulus-dependency.ipynb
+   tutorial/shear-elastic-modulus-dependency.ipynb
+   tutorial/tensor-symmetry

docs/tutorial/tensor-symmetry.rst

@@ -0,0 +1,54 @@
+Symmetries table for elastic tensor
+===================================
+
+The table follows Bragger's (1965) paper.
+
+    Brugger, K. (1965). Pure Modes for Elastic Waves in Crystals. Journal of Applied Physics, 36(3), 759–768. https://doi.org/10.1063/1.1714215
+
+
+Tensor symmetry relationship constraints
+----------------------------------------
+
+Cubic
+"""""
+.. include:: ../../cij/data/constraints/cubic
+   :literal:
+
+
+Orthorhombic
+""""""""""""
+.. include:: ../../cij/data/constraints/orthorhombic
+   :literal:
+
+Tetrahedral (6)
+"""""""""""""""
+.. include:: ../../cij/data/constraints/tetragonal6
+   :literal:
+
+Tetrahedral (7)
+"""""""""""""""
+.. include:: ../../cij/data/constraints/tetragonal7
+   :literal:
+
+Hexagonal
+"""""""""
+.. include:: ../../cij/data/constraints/hexagonal
+   :literal:
+
+Trigonal (6)
+""""""""""""
+.. include:: ../../cij/data/constraints/trigonal6
+   :literal:
+
+Trigonal (7)
+""""""""""""
+.. include:: ../../cij/data/constraints/trigonal7
+   :literal:
+
+Monoclinic
+""""""""""
+.. include:: ../../cij/data/constraints/monoclinic
+   :literal:
+
+
+