Some articles on group pg, pg:
... The group pg contains glide reflections only, and their axes are all parallel ... Examples of group pg Computer generated Mat with herringbone pattern on which Egyptian king stood Egyptian mat (detail) Pavement with herringbone pattern in Salzburg ... left / lower right ignoring colors there is much more symmetry than just pg, then it is p4g (see there for this image with equally colored triangles) Without the details inside the zigzag ...
Famous quotes containing the word group:
“The poet who speaks out of the deepest instincts of man will be heard. The poet who creates a myth beyond the power of man to realize is gagged at the peril of the group that binds him. He is the true revolutionary: he builds a new world.”
—Babette Deutsch (18951982)