VW - CVM 1.1

The Group pg

	Generators:		t1, t2, L
	Relations:		L2 = t1
	Cell diagram:

Table: Three homomorphisms from pg

type	P(k) = -1	wallpaper type of kernel group, with remarks
pg	none	pg, same as the extended group
pg'	L	p1
p'b1g	t2	pg = {t22, L}; new negating glide
	L and t2	same as above, i(L) = L t2

The Group pm Ways to Visualize Wallpaper Functions Why there are 63 Types The Algebra of Wallpapers The Group p2