books the second example is the symmetry group
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# Symmetry group
# Group symmetry
# Mathematics Group Symmetry
# The topic of symmetry and group symmetry
# Example of functional symmetry
# Architectural binary symmetry
# The beauty of symmetry in chemistry
# Symmetry Theory
# law of symmetry
# radial symmetry
# Symmetry elements
# geometry and symmetry
# Symmetry in the surrounding groups
# Similarity and symmetry
# Symmetry criteria
# Symmetry search and actual check
# Symmetry in topology
# Special Cases of Perspective Symmetry
# symmetry-based methods
# Symmetry and simplicity
